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1745-2.6, SLC 150 I/O Expansion Unit

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1. gee onna relay SPIT fates oe ae ot Solenoid ian resistor across 420vAc 45K ohm 3 watt r L S S A ethe load as showr at 240VAC 15K ohm 5 watt L Se es esi ae the nont n io A ee BG septs 7 Transistor outputs Group t Transistor Satputs Group 2 2 oe E Hard c contact VDC and COM are shared we contact VDC and COM are shared relay output a S eee Wiring S Terminals oe 118066 n oe 14 Expansion Unit SLC 150 Output Wiring Wiring connections for expansion unit catalog numbers 1745 E153 1745 Connections E156 and 1745 E157 are shown below continued 1745 153 E156 oe a ee ee No arc c suppression G E D T Hard contact relay outputs Group sie on ee 3 Hard c contact ag outputs Group 2 E VACNDC 1S shared wE 9 T VACVOCi iS shared ae T ATT ma fee Terminals T E E a Suppressor We Cn E a4 SUBIR OF ET ee GE aie ds Se ee lar vac a ee 230VAC oo Me oa DC C voltage KL g a eee he es g ee ai E I T C F ees ce ue eree arc suppression of Re 120 ohms C 0 022 NA Z L 1 Tolimitthe effects of leakage Aa Resistor mace od current use a loading resistor across o 4 20VAC 18K ohm Swan 3 gall eee Scere aes othe load as shown atthe ilies Dg eed 240VAC ASK Miik 5 wat ea te 1745 E 57 Current sinking NPN transistor r outputs C o Bo _ Transistor outputs Group 1s T
2. GS PRODUCT BULLETIN A pata 1745 SLC 150 I O Expansion Unit Catalog Nos 1745 E151 E152 E153 E154 E156 E157 SLC 150 expansion unit os The Expansion Unit The SLC 150 expansion unit can be used with either the SLC 150 processor unit or SLC 100 processor unit to expand the number of I O circuits toa maximum of 112 This is explained in Addressing I O on Page 4 The SLC 150 expansion unit has the same construction as the SLC 150 processor unit Like the processor unit it has 20 inputs and 12 outputs Outputs include triac hard contact and transistor The unit is available in six versions to meet various application requirements See General Specifications Page 16 Subjects covered in this product data sheet Expansion Unit Features Page 2 Output Wiring Connections 12 Installation Considerations 3 SurgeSuppression 15 Addressing I O 4 General Specifications 16 System Layout 6 Input Specifications 17 Mounting s N 6 E N 3 eae de ol N 7 Output Specifications 18 Connection Cables 8 Fuse Replacement 20 Line Wiring Connections 10 Terminal Block Removal 20 Input Wiring Connections 11 Publication 1745 2 6 November 1987 Supersedes Publication 1745 2 6 Dated June 1987 4006 1 002 01 D 2 Expansion Unit SLC 150 oe S input power a Incoming line 1b Wiring terminals g fusecompartment ss wiringter
3. 156 Voltage kang and Frequency 10 250 VAC 50 60 Hz 10 125 VDC Contact Ratings 240VAC 75A 075A Contact Resistance 20 ma typical Electrical Isolation 2000 volts between output contacts and control logic OFF State Leakage Current Outputs at terminals A11 and 81 1 al catalog numbers No leakage current Outputs at terminals A12 thru A16 and B12 thru B16 E 1745 S E153 and 1745 E156 2mA AC voltage only To limit leakage current use a oan resistor across the load as Renown ON eee Page 14 ie a Output Fusing for Overload Protection 7 Bussman 3A 250VAC slow blow or equivalent 20 Expansion Unit SLC 150 Fuse Replacement If the power supply fuse of the unit is blown the DC Power indicator will not illuminate as it does during normal operation The fuse could be blown because of excessive line voltage or because of an internal power supply malfunction After the conditions causing the malfunction have been corrected the fuse can be replaced The fuse compartment is located in the upper left corner next to the incoming power wiring terminals WARNING Contact with AC line potential can cause injury to personnel Remove system power before removing the fuse compartment cover Replacement procedure 1 Remove the fuse compartment cover 2 Remove the fuse holder by pushing the handle to the left then pulling outward 3 Remove the fuse from its holder and repl
4. 50V 1745 E153 E154 E156 E157 4V Maximum OFF State Leakage Current 1745 E151 E152 2 mA 1745 E 153 E154 E156 E157 1mA Nominal Input Current 1745 E151 E152 8 MA 1745 E153 E154 E 156 E 157 4 mA at 12VDC SmAst24V0C R ees ee input Filter Time ON Delay po ie E ais lt z 1745 E151 E152 3 to 13 msec ae S S l Ba 1745 6153 E154 E156 E157 4 to 8 msec Input Filter Time OFF Delay 1745 E151 E152 9to 18 msec 1745 E153 E154 E156 E157 410 8 msec Electrical Optical Isolation E ee S 1500 volts between input voltage and control logic Applie ies to a all catalog numbers EE eects 18 Expansion Unit SLC 150 Output Specifications mar OUTPUTS 1745 61 51 4 152 Hard contact relay S G 19 N Output Voltage nge 85 265 VAC 10A aL 30 C Yo derated to SA at BUY Surge Current 10A for 25 msec Repeat once s each second at 30 C or once each 2secondsat60 C Minimum toad Current 10mA Maximum OFF State Leakage Current 2 mA OFF to ON Response Time non zero crass 0 1 msec max Zero Cross Turn on Timing Accuracy 500 microseconds Saturation Voltage Drop 1 5 volts at 1 0A Electrical Optical Isolation 1500 volts between output voltage and control logic Recommended Output Fusing for Short Circuit Protection San O SOC T4 3A or equivalent TRANSISTOR OUTPUTS 1745 E154 E157 Hard contact relay outputs Page 19
5. SLC 150 processor unit only eC ae Expansion Unit SLC 150 Expansion be SEE 100 LA Expansion Unit SLC150 Expansion Unit SLC 150 Expansion Unit SLC 150 Processor Unit SLC 100 Processor Unit Enclosure 5 Recommended E _ Minimum Spacing A 2 51mm BL 4 102mm 6 152mm ARS SUE 150 E Expansion ne 7 Expansion Unit SLC 150 Mounti ng The expansion unit should be mounted directly to the back panel of your enclosure using four 10 screws Hole locations are shown in the dimension drawing below IMPORTANT Mount the unit on a smooth metal back panel to provide good thermal conductivity Back panel temperature specification 60 C maximum SLC 150 processor and expansion units utilize the mounting back panel as a heat sink for dissipating excess heat generated during operation In high ambient temperature applications 60 C sub panels not exposed to air outside the enclosure could heat up beyond 60 C In these situations the sub panel temperature can be reduced by removing other heat generating equipment from the enclosure or by providing auxiliary equipment for cooling such as fans or air conditioning 2 75 40 25 260 4 mm 69 9 mm 5 45 5 9 139 0 mm 149 9 mm 9 80 4 Mounting Holes 249 0 mm 10 32 x 5 8 Screws 8 Expansion Unit SLC 150 Connection Cable
6. expansion unit power supply circuit One or more emergency stop switches should also be included Follow the recommendations for component spacing within the enclosure to help keep the controller temperature within the specified limits Wiring should be routed to minimize electrical noise effects Surge suppressors should be used for inductive loads in series with hard contacts and for other noise generating equipment Fusing should be provided to protect loads and wiring from short circuits or overloading 4 Expansion Unit SLC 150 a the 7 address blocks are identified i in S LMI Seek E EN Rae RE ROE en EEAO TEE EN ER SO rd To obtain the I O combination best suited to your application you can use various combinations of SLC 150 expansion units and SLC 100 expansion units Assigning addresses is simple once you understand how processor address blocks are allocated Address Blocks The I O image table of the SLC 150 and SLC 100 processor unit consists of 112 I O divided into 7 address blocks 10 input addresses and 6 output addresses per block The SLC 150 processor unit uses blocks 1 and 2 The SLC 100 processor unit uses block 1 In either case the remaining blocks are available to you for adding I O expansion units The figure below identifies the address blocks and summarizes the address block requirements for the various processor and expansion units ek ri sia table to the peZ L block bo 201 210 o
7. 0 op 304310 Oo EEP ETT aten gs Ai e 214216 i 1311 316 sr 150 50 Processor Unit a SC 150 Expansion Unit T SLC 150 High Speed input Module eae SC 100Processor Unit SLE 100Basic Expansion Unit 10 6 SLC 100Relay Output Expansion Unit 0 12 Ste 100Analoginput expansion Unit 80 io eee met a ae a Block 1 and 2 addresses are used pe 1 10 101 110 E 1 Outputs 11 16 111 116 pa All addresses of 2 consecutive blocks are used S J 4 5 SE An internal sao address is associated awa niom gt Block 1 1 addresses are used Inputs 1 10 Outputs 1 16 ne S As addresses of the block are used ae one addresses of 2 consecutive blocks are e used input z k addresses c of the 2 blocks are bypassed G 9 Upper two input Sne 9 101are bypassed AH SA output addresses of the block lt are dg carbone Connection Examples The following examples indicate how you might interconnect expansion units with an SLC 150 processor unit and an SLC 100 processor unit Note that example 1 includes an HSI module SLC 150 Processor SLC 150 SLC 150 Expansion 20 12 170 SLC 150 Expansion 20 12 VO SLC 100 Basic 10 6 I O 20 12 UO Blocks 1 2 None Blocks 3 4 Blocks 5 6 Block 7 EXAMPLE 1 Allinput and output addresses of all 7 address biocks are used The configuration provides 112 I O 70 inputs 42 outputs It also provides 1 high speed input circuit Addressing O fconti
8. Output Voltage Range 10 50 VDC Continuous Output Current per Circuit 1A at 30 C linearly derated to 0 5A at 60 C Continuous Output Current per Chassis 10A at 30 C SA at 60 C Surge Current 3A for 20 msec Repeat once each second at 30 C or once gach 2 seconds at 60 C Minimum Load Current 1 0 mA Maximum OFF State Leakage Current 0 1 mA OFF to ON Response Time 100 microseconds Maximum ON State Voltage Drop ico volts at 1 0A 0 8 volts at 0 5A ne Electrical Optica Isolation 1500 volts between output voltage and control logic a Recommended Output Fusing for Short Circuit Protection os E Z s an O soc ST4 2A or requ valent ee ee ee ae ah a 19 Expansion Unit SLC 150 Outpu t Sp ecifications Specifications for hard contact relay outputs are shown below We continued recommend that you use some type of surge suppression when switching inductive load devices with hard contact outputs Refer to Page 15 HARD CONTACT RELAY OUTPUTS Wiring Terminals internal Arc Sae 1745 E151 1745 6152 1745 6154 1745 157 Units have 2 hard contact relay outputs at terminals A11 and B11 These outputs do not have internal arc suppression buaa Units have 12 hard contact relay outputs Relay A outputs at terminals A12 thru A16 and 812 u 816 have internal arc suppression circuitry Relay outputs at terminals A11 and B11 do not have internal arc SUPDIESSCS circuitry 1745 E153 1745
9. ace it with a recommended replacement fuse CAUTION Use only replacement fuses of the type and rating specified for the unit Improper fuse selection may result in equipment damage 4 Place the fuse holder back into its compartment by pushing inward until it locks into place You may first have to shift the position of the wires 5 Replace the fuse compartment cover 6 Restore power The DC Power indicator should now illuminate Terminal Block Removal The wiring terminal blocks can be removed to allow replacement of an expansion unit without removing power supply input or output wiring To remove a terminal block back out the two screws located at the ends of the terminal block Alternate between the two screws backing out about five turns at atime This will help avoid binding To replace the terminal block align the terminal block screws with the holes on the chassis Alternate between the two screws as you did when removing the terminal block Press on the center of the terminal block as you tighten the screws to help guard against an improper seat CS ALLEN BRADLEY A ROCKWELL INTERNATIONAL COMPANY yy industrial Control Group Milwaukee Wisconsin 53204
10. anan A Saf E socket Access door removed 1745 02 cable SLC 1 100 precessor unit SLC 100 expansion unit SLC 150 expansion unit Connecting an expansion unit to an SLC 100 processor unit Use cable 1745 02 ERIE with the expansion unit Open the access doors 7 S Connecting an expansion unit to an SLC 150 processor unit Use cable 1745 3 supplied with the _ SLC 150 processor unit X 1 Open the access doors oA R 7 2 Connec ing a one e expansion unit ro MAG to another oe oe Use cable 1745 C2 Kila with the z j expansion unit Pea ee G Open the access doors he 2 Refer to illustrations A and B On 2 Refer to illustration A Align the 2 20 2 pin cable connector with the socket _ onthe processor unit Push gently tabs will lock the connector in place lt 3 Align the 10 pin connector with the o expansion unit socket having the keysiot Push gently tabs will lock S E G the connector in place a Close the access doors Refer to illustration B Align the l cable connector having the keysiot with the socket on the processor unit Push gently tabs will lock the p e connector in place a Align the connector kaving the eae ae eae black key with the expansion wae aS socket having the keyslot Push gt gently tabs will tock thec connector K C Ta in place a ey ee with the socket having the S Push gently tabs will lock the the expansion unit already connect
11. e a to another unit Align the cable connector having the keyslot with _ the socket Push gently tabs will ye tock the connector in place On the other expansion dint Align r the connector having the black key S Ke l connector in place Es Connecting an expansion unit a 4 Close the access doors toa high speed input module Same as above but remove the plug from the high speed inpot module socket aa foe asks the access doors 10 Expansion Unit SLC 150 Line Wiring Make line connections to the expansion unit as follows Connections CAUTION Incorrect wire connections can cause damage to the expansion unit power supply Donotjumper 115VAC NEUT and 230VAC NEUT together Do not jumper unused 115VAC NEUT or unused 230VAC NEUT to the CHASSIS GND terminal be nunc Catalog Nos 1745 6151 152 153 6156 oe _24V0C Oo Z S E cae B T B ae Peel Y Nare AN NEC Class 1 ees required for UL listing eee es owe et Catalog No 1745 E154 E157 0 Bi eh 17 Expansion Unit SLC 150 Inpu t Wirin g The diagrams below show typical input devices connected to the Connections expansion unit wiring terminals 1745 E151 E152 current sinking input circuitry we E E SSS oe Teneo oo ee a sl ef ea ef Six COM terminals are connected together internally T i AC Voltage PBZ St C pan em ee PR ry input Wiring Terminals K a 1745 E153 E154 Current sinking i
12. ircuits 1E BE Output addresses of block 3 are bypassed Maximum I O Configuration The maximum I O configuration is 112 using all addresses of the image table If you use SLC 100 relay output or analog input expansion units the maximum configuration will be less and varies with the particular combination of expansion units used Keep in mind that when you ve used all 7 address blocks you ve reached the maximum Internal Addresses Associated with I O Address Blocks The table below lists relay type instruction addresses associated with I O address blocks You can use these addresses in your program but only if expansion units using the associated address blocks are connected to the processor unit If you are using the SLC 100 processor unit addresses 17 and 18 address block 1 can a A eee Me always be used If you are Soe Pe eres ee ey see ee es using the SLC 150 processor Cee REN AWB eevee Be unit addresses 17 18 117 ae Moe Pep ee gh and 118 address blocks Land 517 Sig Poo 2 can always be used on nee 6 ee ee ee System Layout The figure below shows acceptable layouts Follow the recommended minimum spacing to allow for convection cooling within the enclosure Cooling air in the enclosure must be kept within a range of 0 to 60 C Note that SLC 150 and SLC 100 expansion units can be interconnected with either an SLC 150 or an SLC 100 processor unit High speed input modules can be used with the
13. ller User s Manual Surge Suppression for inductive AC Output Devices E Output Device Output Device l Varistor RC Network surge ek Oey gouge lar teat ee Output Devices i l EE S Output Device J Note A surge 2 re ees l suppressor aese Sa nd ERT G Diode alsobe used 16 Expansion Unit SLC 150 General General specifications for the expansion unit are shown below Snecitications fer nee ciue 7 ou iu o vac o 85 132 VAC Soon z 10 Triat 85 265 WAC SOBORZE gt _ Current neSinking i 3 Hard Contact 10 250VAC 0 125V0C e lars Current Si inking 2 Hard Contact S 19 250VAC 10 125V0 ae as Ear ae 8 2 170 265 we d E _ 50 60 HS ins E n 2 ae ey T gt 520 70 eae V vac T 175 E 51 E TE G 53 E1 156 ASVA a By 1 oe 1 6A250V o Types lt a 0 socs SD4 E and 12 outputs See table mote inputs pecifications Page WES S Output specifications Pages 16 21 and 1 19 Ds 17 Expansion Unit SLC 150 cmc i eC ES ES TE A nN Input Spec ifications Input specifications are shown below All input circuits include optical isolation as well as filtering to guard against high voltage transients from external input devices ON State Voltage Range and Frequency 1745 E151 85 132 VAC 47 63 Hz 1745 E152 170 265 VAC 47 63 Hz ee 1745 E 153 E154 156 E157 10 30VDC Maximum OFF State Voltage 1745 E151 30V 1745 E152
14. minals for 0 inputs 3 Color patch SS 8 Expansion unit connection E i ee BE RE RHR SAR BBR DO RR WO Wio RA _ 6 input status indicators ee 7 Output status indicators l mma vr e r co ree ae ist o 2 Wiring terminals 4 Diagnostic 0 forl2outputs indicator Expansion Unit The following features are pointed out in the illustration above Features 1 a Incoming line wiring terminals b Wiring terminals for 20 inputs Self lifting pressure plates allow for easy wire insertion and secure connections Terminals accept two 14 AWG wires The hinged cover shown in the open position has write on areas for identification of external circuits The terminal block is removable for easy expansion unit replacement Terminal Block Removal See Page 20 2 Wiring terminals for 12 outputs The removable terminal block has the same construction as the line input terminal block Hinged cover shown in the open position has write on areas 3 Color patch Red black blue green purple or yellow Identifies the 6 expansion unit versions See General Specifications Page 16 4 Diagnostic indicator DC POWER Indicates that the expansion unit is energized and DC power is being supplied 5 Input power fuse compartment If line terminal voltage is present but the DC POWER LED is not lit the fuse may be blown Refer to Page 20 for fuse replacement procedure 6 Input status indicators Twen
15. nput circuitry DC E i PB2 input Wiring Terminals BC coe Ten o e m a RRR Six COM terminals are connected together internally 1745 E156 E157 Current sourcing input circuitry DS inte Peh zi pes RTE Hc Voltage E T amp ee Z Solid State l PR f R NPN Switch C EE ae Input Wiring i O oO Terminals 12 Output Wiring Connections Wiring connections are shown on Pages 13 and 14 Note that each expansion unit has two isolated groups of outputs plus two additional isolated hard contact relay outputs Triac Outputs Triac outputs include optical isolation as well as MOV protection to guard against possible damage by transients from external outputs Triac output firing can be synchronized with the AC line to accomplish zero cross turn on and minimize noise generated when switching loads This is accomplished by making instruction 866 TRUE in the user program If this feature is used your scan time will be 8 3 msec or some multiple at 60 Hz and 10 msec or some multiple at 50 Hz A common power source must be used for the processor unit power supply and output circuits to achieve zero cross turn on Since triacs turn off at AC line zero cross it is not necessary to use external surge suppression when switching inductive loads However if hard contacts are connected with triacs to switch an inductive load we recommend using varistors for external surge suppression Do not use suppressors having RC net
16. nued 5 Expansion Unit SLC 150 SLC 100 SLC 100 SLC 100 SLC 100 SLC 150 Processor Basic Analog input Relay Output Expansion 10 6 I O 10 6 1 0 8 0 I O 0 12 VO 20 12 UO Block 1 Block 2 Block 3 Blocks 4 5 Blocks 6 7 EXAMPLE 2 All 7 address blocks are used The configuration provides 84 UO 40 digital inputs blocks 1 2 6 7 addresses 1 10 101 110 501 510 601 610 8 analog set points block 3 addresses 201 208 and 36 outputs blocks 1 2 4 5 6 7 addresses 11 16 111 116 311 316 411 416 511 516 611 616 I O Terminal Identification Assume you are adding one of the 4 types of expansion units to an SLC 150 processor unit Address blocks 1 and 2 apply to the processor unit Address blocks 3 and 4 or just 3 apply to the expansion unit I O terminals are assigned addresses as follows SLC 150 inputs ADT AlQ and Blocks 3 and 4 are used A 2 and 8 3 01 B10 Outputs i input addresses 201 210 and 301 310 A11 A16 and B11 B16 Output addresses 211 216 and 311 316 SLC 100 T inputs 1E 10E Block 3 is used Input addresses 201 210 Basic Outputs TTE 16E Output addresses 211 216 SLC 100 Upper terminals Blocks 3 and 4 are used A 2 and A 1 3 Relay Output A 11E 16E Upper addresses 211 216 Lower addresses Lower terminals 311 316 Input addresses of blacks 3 and 4 are A 1 11E 16E bypassed SLC 100 Set points of the 4 Block 3 is used Set point addresses 201 208 Analog input input c
17. ransistor pies Group 2 2 Ward contact VOC and COM are shared p contact VDC and COM are shared relay output y EAS k CRU ee lt Ferminals z oe ip E Z X ieee AE 7 i aes ae Pee ag ee T ae Ce ee fee suppressor o OS T E L ess T ee a L Surge Suppression 15 Expansion Unit SLC 150 Inductive output devices such as motor starters and solenoids may require that you use some type of surge suppression to protect output contacts and minimize noise generation Examples are shown below These surge suppression circuits are connected directly across the output device The effect is to reduce arcing of the output contacts arcing can be caused by the high transient voltage which occurs when an inductive device is switched off Suitable surge suppression methods for inductive AC output devices include a varistor an RC network and an Allen Bradley surge suppressor These components must be appropriately rated to suppress the switching transient characteristic of the particular inductive device For inductive DC output devices a diode is suitable A 1N4004 diode is acceptable for most applications A surge suppressor can also be used Refer to the SLC Programmable Controller User s Manual We recommend that you locate the suppression device as close as possible to the output device Suppressors recommended for use with Allen Bradley relays contactors and motor starters are listed in the SLC Programmable Contro
18. s Two cables are used for interconnecting processor and expansion units Interconnect cable 1745 C3 is a 20 pin to 10 pin cable supplied with the SLC 150 processor unit Interconnect cable 1745 C2 is a 10 pin to 10 pin cable supplied with each expansion unit Both cables are 18 5 inches 47 cm long See the figure below for cable connector details Important Do not use cables longer than those provided Longer cables could affect the integrity of data communications between the processor and expansion units possibly causing unsafe operation Looe OSs oe Opin connector o on eee Soak end of cable ea ae ae ee Mates with ae Raa So EE A aA unit ig i ey R iews n Keylor Mates with white e vont took key on nexpanait Runi bad een laa intercon nect cable h ee _ Black tar Mates ap T on n expansion unit ee Ss Black key Mates with ee on processor unit sie 150 a Gr a o T l re End v views 9 Expansion Unit SLC 150 Connection Cables fcon The figure below explains how to install the interconnect cables tin Boer A Connecting e expansion units to an stc C150 0 processor u unit prane ee gees Wee direction es vevan Cable socket Access door lH oste 100 expansion u unit 1745 C2 cable 1 White key SLC 150 processor unito or E l SLC 150 expansion units nen Facing P direction beim nt unite ON aaa se ce fine id DORT T
19. ty red LEDs identified with address numbers A01 thru A10 and B01 thru B10 corresponding to numbers below the input wiring terminals When an input circuit is energized the corresponding status indicator will be lit 3 Expansion Unit SLC 150 Expa nsion Unit 7 Output status indicators Twelve red LEDs identified with address Features numbers A11 thru A16 and B11 thru B16 corresponding to numbers above the output wiring terminals When a programmed output continued instruction is TRUE the corresponding output status indicator will be lit and the corresponding output circuit will be energized 8 Expansion unit connection Hinged cover is shown open The expansion unit is interconnected with the processor unit and other expansion units via ribbon cable See Connection Cables Page 8 Installation Reter to the SLC Programmable Controller User s Manual for details on Considerations the following important installation considerations The enclosure should be adequate NEMA approved for the environmental conditions of the particular application The processor unit expansion units and input output device circuits should have the same power source The processor and expansion units should be properly grounded Include an electrical disconnect in the enclosure An isolation transformer may also be required A master control relay circuit should be included to permit disabling of the I O devices independent of the processor and
20. works since damage to triacs could occur Refer to Page 15 for further discussion on surge suppression Hard Contact Relay Outputs Outputs at terminals A12 A16 and B12 B16 include are suppression circuitry RC networks which protects contacts when switching inductive loads We recommend that you also connect external surge suppression to protect the contacts from high transient voltage which occurs when an inductive device is switched off Hard contact relay outputs at terminals All and B11 do not include internal arc suppression Contact protection surge suppression See Page 15 Transistor Outputs Expansion unit 1745 E154 has current sourcing PNP transistor outputs Expansion unit 1745 E157 has current sinking NPN transistor outputs We recommend that you connect external surge suppression to protect transistors from the high transient voltage which occurs when an inductive device is turned off An IN4004 diode is acceptable for most applications Refer to Page 15 for further discussion on surge suppression Fusing You should provide appropriate fusing to protect output devices and wiring from short circuits and overload conditions Refer to Pages 18 and 19 for recommended fusing 13 Expansion Unit SLC 150 Output Wiri ng Wiring connections for expansion unit catalog numbers 1745 E151 1745 sanections E152 and 1745 E154 are shown below continued Triac outputs a Sa oe VAC is s shared

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