When the switch is in protected position, the IC697CPU788 CPU configuration can only be changed with a programmer that is connected to the parallel port. The current requirement of the module, including the expansion memory board, is 1.6 Amps. The module is compatible with 5 Volts DC input voltage. The shelf life of the lithium battery is 10 years at 20 degrees Celsius and the battery provides 6 months of nominal memory retention. Up to 352 discrete inputs and outputs and 8000 analog inputs in the simplex mode and 8000 analog outputs in the simplex mode are supported. The IC697CPU788 module uses an 80386DX microprocessor. The clocked speed of the microprocessor is 16 megahertz. The time taken to process a Boolean function is 0.4 microseconds. Four status LEDs provide information about the system to the installers and operators.