This section explains how to install the CMM in the rack (Series 90-70) or baseplate (Series
90-30) and how to configure the module using Logicmaster 90 or the windows-based program-
ming software. Topics covered are:
What you will Need
Installing the CMM
Configuring the CMM
What you will Need
Before you can begin the installation procedure, you must have the following equipment and
A Series 90-70 or Series 90-30 Programmable Logic Controller (PLC).
(For Series 90-30, the CPU must be a model CPU331 or higher.)
A Communications Coprocessor Module (CMM) to install and test:
- IC697CMM711 for a Series 90-70 CMM
- IC693CMM311 for a Series 90-30 CMM
If this application uses CCM protocol with standard default settings for a Series 90-30 CMM
(CMM 311), no other equipment is required.
For other applications, you will also need the following:
A computer with a hard disk.
Programming software (either Logicmaster 90 or windows-based programming software).
Series 90 PLC Serial Communications User’s Manual – November 2000
Installing the CMM Hardware
The first step in the installation procedure is to physically install the CMM hardware and verify
that it is working properly.
In a single rack system, the CMM resides in the same rack as the CPU. In a Series 90-70 mul-
tiple rack system, the CMM can reside in either the CPU rack or in an expansion rack. The
Series 90-30 CMM must reside in the same rack as the CPU.
The following illustration shows one possible system configuration for installing a Series 90-70
CMM in a local or expansion rack:
LOCAL RACK CONFIGURATION
Figure 2-6. Series 90-70 CMM Configurations
The power supply, CPU, and Series 90-70 Bus Expansion Module must reside in specific slots
within the rack. The term Bus Expansion Module includes both Bus Transmitter Modules and
Bus Receiver Modules. The CPU Module must be located in slot 1 of rack 0.
The Series 90-70 system usually includes a Bus Transmitter Module (BTM). Version A of the
Bus Transmitter Module must be located to the right of all other GE boards; version B
must be located in slot 2 of rack 0. If the PLC system will have more than one rack, a Bus Re-
ceiver Module (BRM) must be located in slot 1 of each expansion rack.
The CMM can be placed in any slot not already allocated in any rack, with the following cau-
The configuration files created by the Logicmaster 90 configuration software must match
the physical configuration of the modules. If they do not, the controller may not operate as
expected. Any faults will be logged in the PLC fault table.
When CMMs are in a Series 90-70 rack, all the slots between the CMM and the PLC CPU
must be occupied. If any of these slots are empty, the CMM will not be able to communi-
cate across the backplane to the Series 90-70 PLC CPU.
The Series 90-30 CMM must be in the main rack (baseplate) with the PLC CPU.
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