Series 90-30, Programmable Coprocessor Module, IC693PCM301F
Contents
1. Data Rate Recoverable CCM communication errors such as dropped characters may occur when CCM initiates commands on both ports simultaneously at data rates above 9600 bps It is recommended that the data rate on either CCM port not exceed 9600 bps when using both ports as initiators Important Product Information GFK 0563L WAIT Mode COMMREQ Programming the COMMREQ function block for WAIT mode will degrade PLC sweep time and may halt the PLC CPU turning off its OK LED Do not use WAIT mode COMMREQs unless you have a compelling reason If WAIT mode is used it is absolutely essential that no COMMREQs are sent until the PCM is ready to receive them and that the sum of the worst case PLC sweep time without sending a COMMREQ plus the longer of the two COMMREQ timeout values is less than the PLC CPU watchdog timer setting If two or more WAIT mode COMMREQs can be sent during the same PLC sweep the total of the timeouts for all the COMMREQs must be considered See the Programmable Coprocessor Module and Support Software User s Manual GFK 0255D or later Extra Fault When a WAIT mode COMMREQ which specifies an invalid PCM TASK ID is executed two Bad task id faults are posted to the PLC fault table NOWAIT I O and Ctrl C If a MegaBasic program performs NOWAIT read and NOWAIT write operations simultaneously on the same serial port and the program is aborted with Ctrl C or a MegaBasic STOP statement the PCM may hang if the program is restart2. January 2010 GFK 0563L IMPORTANT PRODUCT INFORMATION READ THIS INFORMATION FIRST Product Programmable Coprocessor Module IC693PCM301F Hardware Identification PC3A2 Software Identification Version 3 01 EPROM Label 395 020H3 01 U36 This is release 3 01 of the Programmable Coprocessor Module PCM IC693PCM301F It enhances and corrects errors in CCM communication The PCM supports application programming in the MegaBasic and C languages The module also communicates using the Communications Control Module CCM protocol Functional Compatibility PCM firmware version 3 01 is compatible with release 1 00 or later of PCM support software IC641SWP063 and release 2 04 or later of PCM development software IC641SWP061B To develop MegaBasic applications you must use one or the other PCM firmware version 3 01 is compatible with release 1 03 of Model 331 CPU IC693CPU331C or later However it is strongly recommended that all release 1 0x users upgrade to CPU release 2 04 IC693CPU331G or later This upgrade is available at no charge See Additional Restrictions When Using a Release 1 0x CPU 331 later in this document for a list of restrictions which apply only when a PCM is used with a release 1 05 or earlier CPU There are no changes to the MegaBasic Programming Language Reference Manual GFK 0256C and PCM Development Software User s Manual GFK 0487B for this release However new material will be added in the next revis
3. ed before the I O operations complete Additional Restrictions When Using a Release 1 0x Model 331 CPU 1 Multiple PCMs and or ADCs When two or more PCMs and or Alphanumeric Display Coprocessor Modules ADCs IC693ADC311 which do not have identical catalog numbers are installed ina programmable controller the modules may not function normally particularly after a short power cycle warm boot Loss of module faults may be posted to the PLC fault table MegaBasic Data Length If a MegaBasic program attempts to write more than 512 bytes of data to the PLC CPU ina single request the CPU watchdog timer will expire turning off the CPU OK LED Lost COMMREQ When two or more PCMs are present a COMMREOQ to either PCM may never complete If a ladder program attempts to send WAIT mode COMMREQs the CPU OK LED may go out after several minutes Ladder programs should always use NOWAIT mode COMMREQs To ensure that transactions are completed a time limit should be established for each COMMREQ using a PLC timer function block When a COMMREQ fails to complete before its timer expires the program can send it again PLC Configuration Change When an I O configuration is stored to the PLC or a Hand Held Programmer operation Autoconfig or clear PLC results in a change to PCM configuration data PCMs must be reset before the new configuration takes effect When the PCM configuration is changed to correct a Configuration mismatch PLC
4. fault a PLC power cycle is required before the PCM will function normally Loss of module PLC faults for the PCM will occur between the time the new configuration is stored and the power cycle Changes and Additions to the User s Manual The text from item 1 Controlling PCM LEDs from MegaBasic under Problems Resolved by this Upgrade in this document will be incorporated into the Programmable Coprocessor Module and Support Software User s Manual GFK 0225 at the next revision
5. in a PCMEXEC BAT command If the task number for PCM firmware release 2 51 or earlier is assumed and MegaBasic runs as the default task number then the application will not be able to control the LED when running in a release 3 00 PCM This problem has been corrected in this release CCM Q N Enquiry Partial N or Q enquiry sequences no longer disrupt detection of valid N or Q enquiry sequences Any valid enquiry sequence will now be responded to regardless of prior transmissions Multidrop Enquiry In multidrop configurations switching from one slave to the next sometimes required a retransmission of the enquiry sequence A retransmission is no longer required Restrictions and Significant Open Problems 1 CCM Timeout On Large Requests CCM requests for 3000 bytes or more of data may occasionally abort with a serial timeout error Error code 0102H Redirection of MegaBasic STDIN When MegaBasic is run with STDIN redirected from a file on an attached PC and execution of the MegaBasic program terminates for any reason MegaBasic is unable to read input characters from the PC file Redirecting STDIN from a PCM RAM disk file works correctly MegaBasic Serial Data Rate When both PCM serial ports are configured for a data rate higher than 9600 bps and a MegaBasic program transmits and receives characters on both ports at the same time the PCM watchdog timer may expire halting operation and turning off the OK LED CCM
6. ion of the Programmable Coprocessor Module and Support Software User s Manual GFK 0255E at the next revision See Changes and Additions to the User Manuals later in this document for information on these changes Special Operational Notes 1 MegaBasic Defaults to Task Seven When MegaBasic is started from an R RUN command ina PCMEXEC BAT file and the command does not specify a task number the PCM operating system assigns MegaBasic to task number 7 This behavior applies to PCMEXEC BAT files created by the PCM operating system as well as files created by users and is consistent with PCM firmware version 2 51 and all earlier releases In PCM release 3 00 MegaBasic defaults to task 15 2 PCM Serial Ports Are not Isolated The two PCM serial ports are not isolated from module ground in either RS 232C or RS 422 RS 485 mode Common mode input signals must be limited to 12 volts or less for RS 422 RS 485 mode An external RS 232C RS 485 converter with common mode isolation is recommended for serial data paths longer than 50 feet 3 Configuration Restriction A Programmable Coprocessor Module PCM may reside only in the main PLC rack Important Product Information GFK 0563L PROM Change PCM RAM including the RAM Disk the RAM device is automatically cleared on the first power up after the PCM PROM U34 is changed If RAM disk files must be preserved they must be stored to an attached personal computer PC before upgrading
7. the PCM firmware and loaded to the PCM after the upgrade Power up Delay The first COMMREOQ sent to a PCM after a power cycle needs to be delayed until the PCM has finished power up initialization See the Programmable Coprocessor Module and Support Software User s Manual GFK 0255D or later for example PLC programs which delay before sending CCM and MegaBasic COMMREQs New Features and Functionality 1 Programmable Receiver Enable Delay Added to CCM Protocol A configurable receiver enable delay has been added to the Software Configuration COMMREQ Command 6104 Reserved Word 21 may specify a delay in units of one millisecond Specifying a non zero value delays the enabling of the receivers to allow for a late echo of any transmission This delay will correct any propagation delay in the link and is only functional in a 2 wire configuration Problems Resolved by this Upgrade 1 Controlling PCM LEDs from MegaBasic When a MegaBasic application is started by a PCMEXEC BAT file the PCM uses a default task number for MegaBasic unless PCMEXEC BAT explicitly specifies a task In this PCM firmware release as well as release 2 51 and all earlier releases the default task number for MegaBasic is seven 7 In release 3 00 the default MegaBasic task number is 15 When the MegaBasic application controls a PCM light emitting diode LED indicator the LED must be configured for control by MegaBasic The MegaBasic task number must be specified
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