System Operation

At power-up, the module checks its internal circuits, memory, and

basic functions. During this time the module status LED remains off. If

the module finds no faults, it turns on its module status LED.

After completing power-up checks, the module waits for valid channel

configuration data from your SLC ladder logic program (channel status

LEDs are off). After channel configuration data is transferred and

channel enable bits are set, the enabled channel status LEDs turn on.

Then the channel continuously converts the thermocouple or millivolt

input to a value within the range you selected for the channel.

Each time the module reads an input channel, the module tests that

data for a fault, i.e. over-range or under-range condition.