GE HE697RTM700B

Connecting PLC Systems with Remote Devices

Industrial automation systems frequently require communication between PLC controllers, remote terminal units, meters, and other intelligent equipment. The GE HE697RTM700B provides a dedicated communication solution for these applications.

Designed for the Series 90-70 PLC platform, this module functions as a Modbus RTU master. It enables the controller to exchange information with multiple slave devices through two independent serial channels.

Each channel supports different communication arrangements. For example, RS-232 can be used for direct connections, while RS-422 and RS-485 support longer-distance or multidrop communication networks.

Communication Capabilities

Dual-channel architecture

Channel 1

Independent serial interface

Channel 2

Independent serial interface

Modbus RTU communication

Remote Modbus Slave Devices

Meters · RTUs · Industrial Controllers · Field Equipment

Important Technical Characteristics

The communication module provides the following capabilities:

• Two independent Modbus RTU master channels.

• Configurable RS-232, RS-422, and RS-485 interfaces.

• Communication speeds up to 19.2 kbps.

• Analog and discrete data transfer.

• Support for multiple commands per remote device.

• Adjustable communication update intervals.

• Individual slave communication status monitoring.

The module can transfer data through standard Modbus RTU commands, including read and write operations. It also supports command lists that allow communication tasks to run with limited continuous intervention from the PLC application.

Hardware and Configuration

The hardware is designed for integration into the Series 90-70 local rack. It requires a compatible CPU and uses the PLC backplane for power and system integration.

Configuration is performed through the applicable GE programming environment. The communication module is configured as a programmable coprocessor module, with its communication parameters established through the PLC configuration and programming tools.

The following points should be considered during setup:

1. Confirm CPU and rack compatibility.

2. Select the appropriate serial interface.

3. Configure baud rate and communication format.

4. Define slave addresses and command lists.

5. Verify data mapping and communication status.

Where It Is Used

The module is suitable for industrial systems requiring communication between centralized PLC equipment and distributed devices.

Common applications include factory automation, electrical monitoring, utility systems, process control, and remote equipment management. In addition, it can support communication with field instruments and other Modbus-compatible devices.

Maintenance and Reliability

Stable communication depends on correct wiring and network configuration. Therefore, technicians should regularly inspect serial connectors, cable shielding, grounding, and communication parameters.

If communication interruptions occur, check slave addresses, baud rates, parity settings, and termination arrangements. Monitoring individual slave status fields can also help identify the source of network problems.