General Information

Core Description

The IC697CPU731 is a high-reliability single-slot PLC central processing unit powered by a 12 MHz 80C186 microprocessor. Fully compatible with the IC697 CHS rack backplane, this unit works seamlessly via VME standard C.1 format to deliver 0.4 microseconds boolean execution and configurable program memory without manual DIP switches or jumpers.

Specific Application

• Executing real-time machinery control and high-speed material handling sequence logic utilizing the 0.4 microseconds per boolean function capability.
• Managing heterogeneous smart I/O networks combining legacy IC660/IC661 blocks with modern rack-mounted discrete and analog I/O modules.
•  Coordinating multi-rack distributed processing topologies using VME backplane links paired with coprocessors or dedicated LAN interface modules.

Ordering Information

System Compatibility

Rack Architecture: Resides strictly in Slot 1 of an IC697CHS PLC rack (such as model 750, 782, 783, 790, or 791) communicating over standard VME C.1 format.

Programming Interfaces: Connects to programmers over Ethernet TCP/IP networks via option modules (IC697CMM741 or IC697CMM742) or through the integrated RS-422 compatible SNP serial port.

Software Platforms: Configured and programmed using MS-DOS or Windows-based software running on legacy operating systems.

Alternative Models & Functional Differences

IC697CPU731 (This Module): Features a fixed-size 32 Kbyte battery-backed CMOS memory architecture and a baseline 12 MHz 80C186 embedded microprocessor.

Higher-Tier IC697 CPU Models: Provide larger scalable memory capacities (such as 64KB, 128KB, or 512KB) and faster processing clocks to handle broader analog or floating-point application code.

IC697CMM741 / IC697CMM742 (Communication Modules): Standalone option modules that expand networking. Unlike the CPU731, they act as peripheral communication interfaces and do not contain the primary PLC instruction execution core.

Installation & Troubleshooting FAQ

Q1: What initial step is mandatory before seating or removing the module?

A: You must ensure that all electrical power to the PLC rack is turned completely off before installing or removing the CPU 731 module to prevent electronic component damage.

Q2: What is the correct protocol when replacing the internal backup battery?

A: You must physically plug in the new replacement lithium battery (model IC697ACC701) into the open spare battery connector before unplugging the old, depleted battery to avoid immediate program and data memory loss.

Q3: What do the front-panel green LED status patterns reveal after turning the power on?

A: The module executes power-up diagnostics, causing the top Module OK LED to blink. Once diagnostics pass successfully, the top LED stays continuously on while the second and third LEDs remain off until software configuration or execution begins.

Q4: Why won't the top Module OK LED remain on after a system power-up cycle?

A: If the top LED fails to stay on during startup diagnostics, the system has detected a fault or a low-battery state, indicating that the memory-retention capability may fall below its standard nominal shelf life.

Q5: How are peripheral I/O and processor hardware choices configured on this module?

A: This module utilizes 100% software-driven configuration, meaning there are absolutely no physical hardware DIP switches or hardware jumpers to set on the circuit board.