The IC697CPU789 module supports various options modules, including an alphanumeric display coprocessor, a bus controller for the IC660/IC661 I/O, an I/O link interface, and IC697 series discrete and analog I/O modules. The OEM and system integrator are responsible for the proper installation and operation of this product. The PLC and module installation must comply with guidelines contained in the hardware installation manual. After the IC697CPU789 module is installed and the system power is turned on, the module should power up and the top LED should start blinking. After the completion of the diagnostics, the top LED is steady and both the second and third LEDs stay off. Now the CPU can be programmed. After programming, the toggle switch on the CPU can be moved to the desired position. The serial port supports both RS-422 and RS-485 serial communication protocols. The power required by the module is 1.6 Amps of current from the 5 Volts DC PLC bus.