Chapter 5. CommunicationsGFK-2222AD April 2018 1995.3.2 Programmable Coprocessor Module (PCM)PACSystems RX7i CPUs with versions 1.50 and higher support IC697PCM711modules with firmwareversions 4.05 and higher. You must ensure that you are using a valid version of the PCM firmware becausethe CPU cannot check the PCM’s firmware version. (The module’s firmware version can be found on alabel attached to the EEPROM.)PACSystems does not support the following with an IC697PCM711:▪ Connecting the programming software to the CPU through the serial ports on the PCM711.▪ Access to Symbolic variables.▪ WAIT mode COMMREQs.▪ The following C functions are not supported:- chk_genius_bus- chk_genius_device- get_cpu_type_rev- get_memtype_sizes- get_one_rackfault- get_rack_slot_faults▪ The C function write_dev will not write to read only references (%S references, transition bits, andoverride bits). If this is attempted, the call will fail at run time and return an error code.▪ The following restrictions apply when using the IC697PCM711 with PACSystems:▪ Access to %W references is partially supported. Only offsets 0—65535 of %W can be accessed viathe PCM.▪ The Program Name is currently always LDPROG1 for PACSystems.▪ In case of ERROR NACK, the Control Program number, privilege level and other piggyback status datawill be set to 0.▪ If an application program running on the PCM accesses the VME bus, the VME addresses being usedby that program must agree with the PACSystems RX7i VME address assignments. The PACSystemsRX7i VME address assignments are described in the PACSystems RX7i User’s Guide to Integration ofVME Modules, GFK-2235.▪ PACSystems CPUs return the major/minor type of the Series 90-70 CPX935 (major type 12, minortype 35) to the PCM scratch pad memory when communicating with a PCM.▪ If your RX7i application program needs to access the PCM’s dual port memory, use the BUS READand WRITE functions. When accessing the PCM, set the Region parameter on the function block to1. (For the PCM, region 1 is predefined to be the module's entire dual port memory.)Note: For details on operation of the IC697PCM711, refer to Series 90 Programmable CoprocessorModule and Support Software, GFK-0255.
