IC693CMM311N - Communications Coprocessor Module

SPECIFICATIONS

Part No.: IC693CMM311N
Manufacturer: General Electric
Product Type: Communications Coprocessor Module
Availability: In Stock
Communication Protocols: GE Fanuc CCM, RTU (Modbus), SNP
Internal Power: 400 mA
Port 1: Supports RS-232
Port 2: Supports either RS-232 or RS-485
Series: VersaMax

Functional Description

IC693CMM311N is a communications coprocessor module developed by GE Fanuc. It is a highly capable Communications Coprocessor Module designed to enhance the performance of Series 90-30 modular CPUs. This module is specifically tailored to work with all modular CPUs in the Series 90-30 family, excluding embedded CPUs, which means it is incompatible with models 311, 313, or 323. The module is versatile, supporting multiple communication protocols, including the GE Fanuc CCM (Computer Communication Module) protocol, the SNP (Series Ninety Protocol), and the RTU (Remote Terminal Unit) Modbus slave communications protocol.

Configuration and Ports

Users have the flexibility to configure the module using specialized configuration software, enabling them to tailor the module's settings to specific application needs. For those who prefer a quicker setup, a default configuration option is available, simplifying the installation process.

The module is equipped with two serial ports designed to facilitate various communication needs:

• Port 1: Supports RS-232 applications, a standard protocol for serial communication, often used for direct communication between two devices.
• Port 2: Offers support for both RS-232 and RS-485 applications, providing flexibility for different communication environments. RS-485 is particularly useful in industrial settings where longer cable lengths and higher noise resistance are required.
• Both of these serial ports are connected to a single module connector. To simplify the wiring process, especially when both ports are in use, the module comes with a Y-cable, which separates the two ports, making it easier to manage connections and reduce potential errors.

Module Integration and Compatibility

• The module allows for the integration of up to four Communications Coprocessor Modules within a system that utilizes a CPU model 331 or higher. This integration must be carried out via the CPU baseplate, ensuring that the module operates seamlessly within the larger system architecture.
• One notable aspect is its behavior in earlier versions, particularly those before version 4.0.
• When both serial ports are configured as SNP slave devices, a unique situation occurs: if a Cancel Datagram request with an ID value of -1 is received at either slave device, it will cancel all established datagrams on both slave devices within the same CMM. This is a departure from the behavior seen in the CMM711 module, where datagrams established on the serial ports operate independently of each other.

Version 4.0 Update

• In July 1996, GE Fanuc released version 4.0 of the module, which addressed the issue of datagram interaction between the two ports when configured as SNP slave devices.
• Prior to version 4.0, when the module was configured with two ports functioning as SNP slave devices, there was a problem with how datagrams (packets of data sent over the network) were handled. Specifically, if datagram cancellation occurred on one port, it could inadvertently affect the other port. This led to communication disruptions and degraded performance in networked environments with multiple devices relying on precise data exchange.
• The version 4.0 update introduced a more refined approach to handling datagram cancellation, ensuring that cancellation or interruption of datagrams on one port would not impact the other port. This improvement isolated the functionality of each port, enhancing the independence and resilience of communication channels.
• By addressing the datagram handling issue, the update significantly improved the reliability of the module, especially in more complex network configurations where multiple devices need to communicate simultaneously without interference. This allowed the module to function more efficiently as an SNP slave device, ensuring accurate and uninterrupted data flow between connected systems.

The WOC team is always available to help you with your Mark I and II requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IC693CMM311N?
It is a Communications Coprocessor Module developed by GE under VersaMax series.

How do I configure the module?
The module can be configured using specialized configuration software. Users also have the option to use a default setup for a quicker and simpler installation process.

How many Communications Coprocessor Modules can be used in a system?
You can use up to four modules in a system, provided the system has a CPU model 331 or higher. These modules must be installed via the CPU baseplate.

What was the issue with datagram cancellation in earlier versions?
In versions before 4.0, when both ports were configured as SNP slave devices, receiving a Cancel Datagram request with an ID value of -1 at either port would cancel all established datagrams on both ports within the same module.

How was the datagram cancellation issue resolved?
The issue was resolved in version 4.0, released in July 1996. This update ensured that datagram cancellations on one port did not affect the other port, allowing for independent operation and improving reliability.

What is the purpose of the Y-cable that comes with the module?
The Y-cable is provided to separate the two serial ports on the module, making wiring easier and more organized when both ports are in use.