Series 90-70 Communications And Intelligent Option Modules; Communications Coprocessor Module (Cmm) - GE PACSystems RX7i Reference Manual

Chapter 5. Communications
5.3 Series 90-70 Communications and Intelligent Option
Modules
PACSystems RX7i supports the following Series 90-70 communications and intelligent option modules:
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Communications Coprocessor Module (CMM), IC697CMM711
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Programmable Coprocessor Module (PCM), IC697PCM711
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DLAN Interface Module, IC697BEM763
5.3.1

Communications Coprocessor Module (CMM)

PACSystems RX7i CPUs with versions 1.50 and higher support IC697CMM711 modules with firmware
versions 4.20 and higher. You must ensure that you are using a valid version of the CMM firmware
because the CPU cannot check the CMM's firmware version. (The module's firmware version can be
found on a label attached to the EEPROM.)
PACSystems does not support the following with an IC697CMM711:
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Access to Symbolic variables
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WAIT mode COMMREQs.
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Connecting the programming software to the CPU through the CMM's serial ports.
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Permanent datagrams.
The following restrictions apply when using the IC697CMM711 with PACSystems:
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Access to %W references is partially supported. Only offsets 0—65535 of %W can be accessed via
the CMM.
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The Program Name is currently always LDPROG1 for PACSystems.
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Reads and writes beyond currently configured reference table limits will report a minor code error of
90 (REF_OUT_OF_RANGE) instead of F4 (INVALID_PARAMETER) as reported on the Series 90-70.
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In case of ERROR NACK, the Control Program number, privilege level and other piggyback status data
will be set to 0.
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PACSystems CPUs return the major/minor type of the 90-70 CPX935 (major type 12, minor type 35)
to the CMM scratch pad memory when communicating with a CMM.
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Control Program Number will be returned as 01 in PACSystems instead of FF as reported on the
Series 90-70.
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If your RX7i application program needs to access the dual port memory of a CMM, use the BUS READ
and WRITE functions. When accessing the CMM, set the Region parameter on the function block to
1. (For the CMM, region 1 is predefined to be the module's entire dual port memory.)
Note: For details on operation of the IC697CMM711, refer to the Series 90 PLC Serial
Communications User's Manual, GFK-0582.
198 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD