USER MANUAL - PROCON Electronics
Contents
1. 30 50 mm EDGE 4mm m FEEDER 6 DATA ADDRESSES The data in the modules is stored in registers These registers are accessed over the network using the MODBUS communication protocol The MODBUS mode used is the RTU mode with the following set up BAUD RATE 9600 DATA BITS 8 PARITY NONE STOP BITS 1 There are 4 types of variables which can be accessed from the module Each module has one or more of these data variables Type Start Address Variable 1 00001 Digital Outputs 2 10001 Digital Inputs 3 30001 Input registers Analog 4 40001 Output registers Analog Note Due to the limited buffer memory size in the modules the Modbus message length must be limited to 8 consecutive read or write registers If more registers are required then a new poll group must be added for the next 8 registers 6 1 LD220 Dual Channel Detector MODULE TYPE 35 Modbus Register Name Low High Access Comments Address Limit Limit 10001 Digital Input 1 0 1 R Loop1 Fault Status 10002 Digital Input 2 0 1 R Loop1 Detect Status 10003 Digital Input 3 0 1 R Loop2 Fault Status 10004 Digital Input 4 0 1 R Loop2 Detect Status 10005 Digital Input 5 0 1 R Loop1 Error Open circuit 10006 Digital Input 6 0 1 R Loop1 Error Short circuit 10007 Digital Input 7 0 1 R Loop2 Error Open circuit 10008 Digital Input 8 0 1 R Loop2 Error Short circuit 00009 Digital Output 1 0 1 R W Relay 1 00010 Digital Output 2 0 1 R W Relay 2 30002. Check the wiring Tighten screw terminals Check for pinched or bent wires Is the feeder wire twisted Check for cracks in the road surface near the loop Check that there is no short circuit on the loop feeder wiring or the loop If there is no short circuit then the inductance is to small and more turns of wire should be added to the loop Check that there is electrical continuity on the loop This can be done using a multimeter on the ohms range lt 5 Q If the loop inductance is to large then try reducing the number of turns 4 RELAY FUNCTIONALITY RELAYS VEHICLE NO VEHICLE LOOP FAULTY NO POWER PRESENT N O CLOSED OPEN CLOSED CLOSED PRESENCE RELAY N C OPEN CLOSED OPEN OPEN N O PULSE CLOSED OPEN CLOSED CLOSED PULSE RELAY N C PULSE OPEN CLOSED OPEN OPEN 5 LOOP INSTALLATION GUIDE The detector should be installed in a waterproof housing as close to the loop as possible The loop and feeder should be made from insulated copper wire with a minimum cross sectional area of 1 5mm The feeder should be twisted with at least 20 turns per metre Joints in the wire are not recommended and must be soldered and made waterproof Faulty joints could lead to incorrect operation of the detector Feeders which may pick up electrical noise should use screened cable with the screen earthed at the detector The loop should be either square or rectangular in shape with a minimum distance of 1 metre
3. between opposite sides Normally 3 turns of wire are used in the loop Large loops with a circumference of greater than 10 metres should use 2 turns while small loops with a circumference of less than 6 metres should use 4 turns When two loops are used in close proximity to each other it is recommended that 3 turns are used in one and 4 turns in the other to prevent cross talk Cross talk is a term used to describe the interference between two adjacent loops To avoid incorrect operation of the detector the loops should be at least 2 metres apart and on different frequency settings For loop installation slots should be cut in the road using a masonry cutting tool A 45 cut should be made across the corners to prevent damage to the wire on the corners The slot should be about 4mm wide and 30mm to 50mm deep Remember to extend the slot from one of the corners to the road side to accommodate the feeder Best results are obtained when a single length of wire is used with no joints This may be achieved by running the wire from the detector to the loop around the loop for 3 turns and then back to the detector The feeder portion of the wire is then twisted Remember that twisting the feeder will shorten its length so ensure a long enough feeder wire is used After the loop and feeder wires have been placed in the slot the slot is filled with an epoxy compound or bitumen filler TRAFFIC DIRECTION Em 300mm ROAD SURFACE SLOT ROAD SEALANT
4. 1 S W Version N A N A R High Byte Software Version Module Type Low Byte 35 30002 Digital I O N A N A R 0 bit 15 0 bit 14 0 bit 13 0 bit 12 0 bit 11 0 bit 10 Relay 2 bit 9 Relay 1 bit 8 Loop2 Error Short circuit bit 7 Loop2 Error Open circuit bit 6 Loop1 Error Short circuit bit 5 Loop1 Error Open circuit bit 4 Loop2 Detect Status bit 3 Loop2 Fault Status bit 2 Loop1 Detect Status bit 1 Loop1 Fault Status bit 0 40003 Seconds 0 65535 R W Real Time Clock 40004 Minutes 0 65535 R W 40005 Hours 0 65535 R W E 40006 Days 0 65535 R W i 40007 Date 0 65535 R W 40008 Month 0 65535 R W 40009 Year 0 65535 R W 40010 Counter 1 LSB 0 65535 R W Counter MSB and LSB combine to give a 32 bit 40011 Counter 1 MSB 0 65535 R W Counter with range 0 to 4294967295 10 40012 Counter 2 LSB 0 65535 R W 40013 Counter 2 MSB 0 65535 R W 40014 Node ID 0 65535 R W Network ID default 254 40015 Mode 0 65535 R W 0 bit 7 0 bit 6 pulse relay2 1 undetect 0 detect bit 5 pulse relay1 1 undetect 0 detect bit 4 relay2 1 pulse 0 presence bit 3 relay1 1 pulse 0 presence bit 2 pres relay 1 modbus 0 detector bit 1 direction logic 1 0n 0 off bit 0 40016 Det Sensitivity 1 0 65535 R W X0 01 40017 Det Sensitivity 2 0 65535 R W X0 01 40018 UnDet Sens 1 0 65535 R W X0 01 40019 UnDet Sens 2 0 65535 R W X0 01 40020 Pulse Time 1 0 65535 R W X10ms 40021 Pulse Time 2 0 65535 R W X10ms 40022
5. Filter 1 0 65535 R W X10ms 40023 Filter 2 0 65535 R W X10ms 40024 UnDet Time 1 0 65535 R W X10ms 40025 UnDet Time 2 0 65535 R W X10ms 40026 Reset Seconds 0 65535 R W 40027 Reset Minutes 0 65535 R W 40028 Reset Hours 0 65535 R W 40029 Reset Days 0 65535 R W 40030 Reset Date 0 65535 R W 40031 Reset Month 0 65535 R W 40032 Reset Year 0 65535 R W 40033 Reset Counter 0 65535 R W 40034 Pwr_Down Cntr 0 65535 R W 40035 Re Tune Cntr 1 0 65535 R W 40036 Re Tune Cntr 2 0 65535 R W 40037 Not Used 0 65535 R W 40038 Loop1Freq MS 0 65535 R W Frequency MSB and LSB combine to give a 32 B 40039 Loop1Freq 0 65535 R W bit value LSB 40040 Loop2Freq MS 0 65535 R W B 40041 Loop2Freq 0 65535 R W LSB 40042 Delta 1 0 65535 R W Change in loop inductance 40043 Delta 2 0 65535 RAN i 40044 Delta 1 MIN 0 65535 R W Smallest change in inductance 40045 Delta 2 MIN 0 65535 R W 11
6. LD220 DUAL LOOP DETECTOR WITH MODBUS COMMUNICATIONS USER MANUAL STANFIELD 3613 27 031 7028041 ELECTRONICS SOUTH AFRICA proconel proconel com www proconel com 18 08 2005 V3 0 1 2 Ce SS AN OVERVIEW OF THE LD220 MODBUS SYSTEM 3 LD220 HARDWARE csc ce ce ca la 5 23 SPECIFICATIONS memme 5 2 2 6 DIAGNOSTICS cee ee 7 RELAY FUNCTIONALITY 12500 8 LOOP INSTALLATION GUIDE 8 DATA ADDRESSES e M A 9 6 1 10220 DUAL CHANNEL DETECTOR MODULE TYPE 35 10 TABLE OF CONTENTS 1 AN OVERVIEW OF THE LD220 MODBUS SYSTEM The LD220 is a series of dual channel inductive loop detectors The use of microprocessor and surface mount technology enables a large number of functions to be incorporated into a small package The LD220 is compatible with most dual channel detectors on the market and is easy to set up and install All configuration is done through the communications port The LD220 is supplied with a RS485 communications port The LD220R is supplied with a RS232 communications port Typical applications in the parking and access control environments are safety loops arming loops and entry or exit loops and direction logic with counting The LD220 consists of an inductive loop detector with an integral RS485 communications port The unit ha
7. TRAL 12VAC DC 2 POWER INPUT EARTH 9 Comms RJ45 RS485 LD220 Pin Name Function 1 N C Not used no connect 2 485 Line of 485 Comms 3 485 Line of 485 Comms 4 N C Not used no connect View From Cable side of connector Looking into hole 1234 Comms RJ45 RS232 LD220R Pin Name Function 1 N C Not used no connect 2 TXD RS232 Transmit 3 RXD RS232 Receive 4 GND RS232 Common View From Cable side of connector Looking into hole 1234 3 DIAGNOSTICS SYMPTOM The POWER LED is not on The DETECT LED flashes erratically The DETECT LED randomly stays on The LOOP FAULT LED is flashing The LOOP FAULT LED is permanently illuminated POSSIBLE CAUSE No power supply voltage on the input There may be a poor connection in the loop or loop feeder The detector may be experiencing crosstalk vith the loop of an adjacent detector Faulty loop or loop feeder wiring Movement of the loop in the ground The loop inductance is to small or the loop is short circuit The loop inductance is to large or the loop is open circuit SOLUTION Check that the power supply is correctly wired to the detector PINS 1 and 2 Check all wiring Tighten screw terminals Check for broken wires Try changing frequencies using the frequency switch Put the detector with the larger loop onto low frequency and the detector with the smaller loop onto high frequency
8. ncy switch setting If the frequency switch is on the frequency is reduced It may be necessary to change the frequency to prevent cross talk between adjacent loops Filter Option This option is used to provide a delay between detection of the vehicle and switching of the output relay This delay is normally used to prevent false detection of small or fast moving objects Direction Logic This feature enables the detector to give a pulse output on relay1 for a vehicle traveling from loop1 to loop2 and a pulse output on relay2 for a vehicle traveling from loop2 to loop1 Loop Fault Indicator This LED Indicator is illuminated when the loop is either open circuit or short circuit and is used to give a visual indication of a faulty loop Power Indicator This LED Indicator illuminates when power is present Detect Indicator This LED Indicator is illuminated when there is a vehicle over the loop or the loop is faulty This LED can also be used to determine the loop frequency On reset count the number of times the LED flashes Multiply this number by 10KHz For example if the LED flashes 6 times then the loop frequency is between 60KHz and 70KHz e Network Layout The diagram below shows how the LD220 may be connected to a Modbus network The LD220 can be placed on the network with other I O products such as the popular MOD MUX from Procon Electronics A typical application is where a PC Personal Computer is connec
9. s been developed to enable remote monitoring and control of the loop detector over a RS485 network The communications allows access to internal setup parameters such as sensitivity timers as well as counters The LD220 can be multi dropped on the RS485 network with other detectors and logic units or linked to a PC running software for configuration and monitoring of the parking system Non volatile memory is used to store counters and all configuration parameters Standard features of the logic on the unit are RS485 Communications Port The RS485 communications port enables up to 127 detectors to be networked on a single twisted pair cable The LD220 communicates using the Modbus protocol in Binary mode All configuration data is held in modbus registers and can be setup by a PC or PLC on the network Selectable Pulse Time This feature sets the length of time that the pulse relay will be energized Pulse Relay Selection The Pulse relay may be configured to energize on detection of a vehicle or when the vehicle leaves the loop Sensitivity Boost This feature sets the undetect level to maximum sensitivity and is used to prevent loss of detection of high bed vehicles Switch selectable Sensitivity The detect sensitivity is the minimum change in inductance required to produce a detect output AL L Switch selectable Frequency The frequency of the loop is determined by the inductance of the loop and the freque
10. ted to the Network Many SCADA software packages support the MODBUS Master Protocol and can hence retrieve data from the LD220 as well as Input Modules or send data to Output Modules The serial port of the PC is connected to an RS232 RS485 Converter which in turn is connected to the Network INPUTS LINK C 232 485 CONVERTER 120 ohm Termination MODBUS MASTER yo 2 LD220 HARDWARE 2 1 SPECIFICATIONS POWER REQUIREMENT LD220 220VAC 15 50Hz LD221 110VAC 15 60Hz LD222 12 24VAC DC 15 RELAY OUTPUT These outputs has are either a normally open or normally closed relay contact rated at 0 5A 220VAC select with internal jumper INDICATORS LED indicator s show Power Detect state and Loop Fault DETECTOR TUNING RANGE 15 1500 uH FREQUENCY Single step adjustable internal jumper PROTECTION Loop isolation transformer with lightening protection CONNECTOR 11 Pin Connector on rear of unit DIMENSIONS 80mm HIGH X 40mm WIDE X 79mm DEEP OPERATING TEMPERATURE 40 C to 80 C STORAGE TEMPERATURE 40 C to 85 C HUMIDITY up to 95 non condensing Complies with EMC Directive 89 336 EEC and Low Voltage Equipment Directive 73 23 EEC 2 2 WIRING 10 7 m PRESENCE Rp PRESENCE PULSE RELAY PULSE RELAY 11 OUTPUT 1 8 OUTPUT 2 TWISTED 3 LOOP 1 INPUT CABLE O 4 TWISTED mO 5 EEEE EEEIEE ERETTE LOOP 2 INPUT CABLE l O 6 LIVE 220VAC 12VAC DC 1 NEU
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