Spectrum Controls 1746sc-NI8u - Manual (Page 69)

Chapter 5: Ladder Program Examples 57
Figure 5.9 Data table for PID Control
address 15 data 0 address 15 data 0
N10:0 1000 0000 1001 0111
Data Table
Monitoring Channel
Status Bits The example shows how you could monitor the open circuit error bits of
each channel and set an alarm in the processor if one of the inputs
opens. An open circuit error can occur if one of the input signal wires
gets cut or disconnected from the terminal block, or if the CJC sensors
are not installed or are damaged.
Important: If a CJC input is not installed or is damaged, all
thermocouple alarms are set, and their respective channel LEDs blink.