GE IC693PCM301 Programmable Coprocessor Module: Technical Overview
The GE IC693PCM301 Programmable Coprocessor Module is a high-performance microcomputer designed for the Series 90-30 PLC platform. This module acts as a flexible interface, enabling communication with a wide variety of devices through its serial ports. Engineers can configure the IC693PCM301 to operate in two distinct modes: as a Communications Coprocessor Module (CCM) or as an ASCII/BASIC Module (ABM). This dual-mode capability makes it a versatile tool for industrial automation applications.
When operating as a CCM, the IC693PCM301 handles complex communication tasks between the PLC and external devices like industrial computers, peripheral monitors, and process controllers. It manages data exchange protocols, offloading processing from the main PLC CPU. In ABM mode, the module runs MegaBasic applications directly, allowing for local data acquisition, storage, retrieval, and real-time computing. This is particularly useful for applications that require custom logic or operator interface functions without burdening the central controller.
Key Design and Integration
The GE IC693PCM301 occupies a single slot in any Series 90-30 baseplate, simplifying installation. It does not support hot-swapping, so technicians must power down the system before insertion or removal. The module maintains user memory during power interruptions using an internal lithium battery, ensuring data integrity. Three status LEDs provide visual feedback: one OK LED indicates module health (solid when normal, off when faulty, flashing during power-up diagnostics), and two user-configurable LEDs allow custom status indicators for specific processes.
For engineers working with Series 90-30 systems, the IC693PCM301 offers a practical way to add intelligent communication and processing capabilities. Its dual-mode operation reduces the need for separate hardware modules, streamlining the overall system design. By leveraging the module's MegaBasic interface functions, users can edit and adapt programs directly on the coprocessor, enabling rapid prototyping and troubleshooting. The serial ports support both CCM and ABM functions, providing flexibility in network topology and device connectivity.
Practical Applications
Typical applications include bridging a Series 90-30 PLC to a supervisory control system, running custom data logging routines, or managing operator interfaces through serial links. The IC693PCM301 excels in scenarios where real-time computing or dedicated communication handling is required without compromising PLC scan times. Its ability to function as a standalone microcomputer within the rack makes it an efficient solution for distributed control architectures.
When integrating the module, verify that the firmware and application requirements align with the chosen mode (CCM or ABM). The module's built-in diagnostics and LED indicators simplify initial setup and ongoing monitoring. For maximum reliability, use the recommended programming tools and follow safety precautions due to the lack of hot-swap support. Overall, the GE IC693PCM301 remains a reliable choice for enhancing Series 90-30 PLC systems with advanced coprocessing capabilities.