The CPU 772 is a single slot PLC CPU which allows floating point calculations. The CPU 772 is programmed and configured by MS-DOS or WIndows based programming software to perform real time control of machines, processes and material handling systems. The CPU 772 communicates with I/O and smart option modules over the rack mounted backplane (IC697CHS750, 782, 783, 790, 791) by way of the VME C.1 Standard format.

Supported option modules include IC697 LAN interface modules, several Coprocessor modules, Bus Controller for IC660/IC661 I/O products, Communications modules, I/O Link Interface, and all of the IC697 family of discrete and analog I/O modules (see the applicableProgrammable Controller Installation Manual for more information on supported modules).

Program and data memory for the CPU 772 is available by attachment of an expansion memory board with either 64, 128, 256 or 512 Kbytes of battery-backed CMOS RAM. Operation of this module may be controlled by the three position switch or remotely by an attached programmer and programming software. CPU status is indicated by three green LEDs on the front of the module.

Batteries

A lithium battery (IC697ACC701) is installed as shown in Figure 2. This battery maintains program and data memory when power is removed and operates the calendar clock. Be sure to install the new battery before removing the old battery. If during power-up diagnostics a low battery is detected the Module OK LED (top) will not stay on. Specific indication of a low battery state is detailed in Reference 3.