GE 90-30 PLC Series Installation And Hardware Manual page 212

8
IC693CMM311 Communications Coprocessor Module (CMM)
The Communications Coprocessor Module (IC693CMM311) provides a high performance
coprocessor for all Series 90-30 modular CPUs (cannot be used with embedded CPUs - models
311, 313, or 323). This module supports the GE CCM communications protocol, the RTU
(Modbus) slave communications protocol, and the SNP protocol. This module has two serial ports.
Port 1 supports RS-232 applications and Port 2 supports either RS-232 or RS-485 applications.
The module can be configured using the configuration software, or by using a default setup.
Since both serial ports are wired to the module's single connector, an IC693CBL305 Wye cable is
supplied with this module to separate the two ports for ease of wiring. A system with a 331 or
higher CPU can have up to four CMMs (in the CPU baseplate only).
Figure 8-20. Communications Control Module
Communications Control Module Documentation
For more information, refer to GFK-0582, the Series 90 PLC Serial Communications Driver User's
Manual.
8-34 Series 90-30 PLC Installation and Hardware Manual – August 2002
OK
COMM OK
COPROC
US1
US1
US2
US2
RESTART
COMBINED
SERIAL PORT
PORT1
&
PORT2
a44902
GFK-0356Q