Chapter 5. Communications198 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD5.3 Series 90-70 Communications and Intelligent OptionModulesPACSystems RX7i supports the following Series 90-70 communications and intelligent option modules:▪ Communications Coprocessor Module (CMM), IC697CMM711▪ Programmable Coprocessor Module (PCM), IC697PCM711▪ DLAN Interface Module, IC697BEM7635.3.1 Communications Coprocessor Module (CMM)PACSystems RX7i CPUs with versions 1.50 and higher support IC697CMM711 modules with firmwareversions 4.20 and higher. You must ensure that you are using a valid version of the CMM firmwarebecause the CPU cannot check the CMM’s firmware version. (The module’s firmware version can befound on a label attached to the EEPROM.)PACSystems does not support the following with an IC697CMM711:▪ Access to Symbolic variables▪ WAIT mode COMMREQs.▪ Connecting the programming software to the CPU through the CMM’s serial ports.▪ Permanent datagrams.The following restrictions apply when using the IC697CMM711 with PACSystems:▪ Access to %W references is partially supported. Only offsets 0—65535 of %W can be accessed viathe CMM.▪ The Program Name is currently always LDPROG1 for PACSystems.▪ Reads and writes beyond currently configured reference table limits will report a minor code error of90 (REF_OUT_OF_RANGE) instead of F4 (INVALID_PARAMETER) as reported on the Series 90-70.▪ In case of ERROR NACK, the Control Program number, privilege level and other piggyback status datawill be set to 0.▪ 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.▪ Control Program Number will be returned as 01 in PACSystems instead of FF as reported on theSeries 90-70.▪ If your RX7i application program needs to access the dual port memory of a CMM, use the BUS READand WRITE functions. When accessing the CMM, set the Region parameter on the function block to1. (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 SerialCommunications User’s Manual, GFK-0582.
