GE IC693CMM302 Replacement for Series 90-30 CCM

Product Overview

GE IC693CMM302 Replacement for Series 90-30 CCM: Seamless Migration & Compatibility Upgrade

The GE IC693CMM302 is a dual-port serial Communication Co-Processor Module (CCM) designed for the GE Series 90-30 PLC platform. As legacy automation systems age and original GE IC693CMM302 units reach end-of-life or become increasingly difficult to source, plant engineers and system integrators face mounting pressure to maintain uptime without triggering a full control system overhaul. This replacement solution is engineered to deliver a smooth, low-risk migration path — preserving your existing wiring infrastructure, rack architecture, and communication protocols while restoring full system functionality.

Whether you are replacing a failed unit in a running production line, upgrading a discontinued module in a Series 90-30 rack, or consolidating spare parts inventory ahead of a planned retrofit, the IC693CMM302 replacement module slots directly into your existing IC693CHS391 or IC693CHS397 baseplate without mechanical modification. The module supports both SNP and SNP-X serial communication protocols, ensuring backward compatibility with upstream SCADA hosts, HMI panels, and programming workstations already configured for GE’s native communication stack.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful IC693CMM302 migration rarely involves a single module swap. In practice, field engineers upgrading a Series 90-30 control cabinet often encounter a cascade of interdependent components that must be evaluated in parallel. The IC693CMM302 communicates with the host CPU — typically an IC693CPU374 or IC693CPU364 — via the Series 90-30 backplane bus. If the CPU firmware is outdated, the replacement CCM may not initialize correctly; a coordinated firmware review of the IC693CPU374 is therefore recommended before commissioning the new module.

On the power supply side, the IC693PWR321 or IC693PWR330 rack power supply must be verified to deliver stable 5 VDC backplane voltage under full slot load. Adding or replacing a CCM module changes the backplane current draw, and an aging power supply operating near its rated capacity may exhibit intermittent faults after the swap. Inspecting and, where necessary, replacing the IC693PWR321 as part of the same maintenance window eliminates a common post-retrofit failure mode.

For installations where the IC693CMM302 is used to bridge the Series 90-30 rack to a Modbus RTU network — a common configuration in water treatment, oil & gas, and discrete manufacturing — the RS-485 wiring termination at the IC693CMM302 port must be re-verified after module replacement. Shielded twisted-pair cabling connected to downstream field devices, remote I/O drops, or third-party drives should be inspected for correct termination resistance (typically 120 Ω at each end of the bus segment). If the existing installation uses IC693MDL655 discrete input modules or IC693ALG222 analog input modules on the same rack, their configuration data stored in the CPU does not require modification — the CCM replacement is transparent to I/O module addressing.

Sites running GE’s Genius Bus architecture may have an IC693BEM331 Bus Interface Module installed alongside the IC693CMM302 in the same rack. The BEM331 operates independently on the Genius Bus and is unaffected by the CCM swap, but its bus address and block configuration should be documented before any rack maintenance to avoid accidental reconfiguration. Similarly, if an IC693CMM311 or IC693CMM321 Ethernet module is present in the rack, its TCP/IP settings and SRTP session parameters remain intact during the CCM replacement procedure.

For HMI connectivity, many Series 90-30 installations use a dedicated serial link from the IC693CMM302 Port 1 to a GE QuickPanel or third-party operator panel. After module replacement, the HMI communication parameters — baud rate, parity, stop bits, and SNP slave address — must be re-entered into the replacement CCM using Proficy Machine Edition’s hardware configuration tool. This is a five-minute configuration step, not a rewiring task, and it is the only software change required for a standard drop-in replacement.

Retrofit Guidance FAQ

Q: Do I need to modify my existing wiring when replacing the IC693CMM302?
No. The IC693CMM302 replacement module uses the same 15-pin D-sub serial port connectors on both Port 1 and Port 2. Your existing RS-232 or RS-485 cables connect directly without any pin-out changes. Simply transfer the cable connectors from the old module to the new one after seating the replacement in the rack slot.

Q: Will my existing Proficy Machine Edition hardware configuration work with the replacement module?
Yes. The replacement IC693CMM302 is recognized by Proficy Machine Edition under the same hardware catalog entry as the original GE module. No hardware configuration changes are required in your PLC program. The module’s CCM configuration parameters (port mode, baud rate, protocol, slave address) are stored in the CPU and are automatically downloaded to the replacement module on the first power cycle.

Q: Is the replacement compatible with Logicmaster 90-30 programming software?
Yes. Sites still running Logicmaster 90-30 on legacy programming workstations can configure the replacement IC693CMM302 using the same CCM configuration screens. No software upgrade is required on the programming side.

Q: What communication protocols does the replacement IC693CMM302 support?
The module supports SNP (Series Ninety Protocol), SNP-X, Modbus RTU (master and slave), Modbus ASCII, and generic serial (user-defined ASCII). This matches the full protocol set of the original GE IC693CMM302, ensuring compatibility with all existing SCADA, HMI, and field device connections.

Q: Can the replacement module be installed in any slot of the Series 90-30 rack?
Yes. The IC693CMM302 occupies a single I/O slot and can be installed in any available slot position in the IC693CHS391, IC693CHS397, or IC693CHS398 rack. Slot position does not affect module functionality, but it must match the slot assignment configured in the CPU hardware configuration file.

Q: How do I verify the replacement module is functioning correctly after installation?
After seating the module and powering up the rack, the IC693CMM302’s LED indicators should show: PWR (green, steady), PORT 1 TX/RX (flashing during communication), PORT 2 TX/RX (flashing if Port 2 is active). Use Proficy Machine Edition’s online diagnostics to confirm the module status registers are reporting normal operation. A successful SNP connection from the programming workstation to the CPU via the CCM port confirms end-to-end communication integrity.

Warranty Assurance

Every IC693CMM302 replacement module supplied by TOPNLMS is covered by a 12-Month Replacement Warranty from the date of shipment. Prior to dispatch, each unit undergoes a multi-stage outgoing quality inspection that includes visual inspection, backplane connector integrity check, port loopback communication test, and power consumption verification. Units that do not pass all inspection criteria are quarantined and not shipped.

In the event of a warranty claim, TOPNLMS provides a replacement unit dispatch within 3 business days of claim confirmation. Customers are not required to return the defective unit before the replacement is shipped for orders with documented installation records. Our after-sales response team is reachable via email and phone during business hours (UTC+8), and warranty claims are processed without requiring third-party RMA authorization.

For procurement teams managing spare parts programs, TOPNLMS offers multi-unit stocking orders with consistent lead times and batch test reports available on request. All units are shipped in anti-static packaging with individual serial number labeling to support your incoming inspection and asset management processes.

Stock availability is updated in real time. In-stock units ship within 1–3 business days from our Xiamen warehouse. Express international shipping options (DHL, FedEx, UPS) are available for urgent replacement requirements.