And Analog Differences - Honeywell SmartLine ST 700 User Manual

5.6.1 DE and Analog Differences
Failsafe operation is different between DE and analog operation:
•
Analog operation – Upscale failsafe drives the transmitter output to 21.8mA. Downscale
failsafe drives the transmitter output to 3.8mA.
•
DE operation – Upscale failsafe causes the transmitter to generate a + infinity digital signal.
Downscale failsafe causes the transmitter to generate a – infinity digital signal.
The transmitter electronics module interprets either signal as not-a-number and initiates its own
configured failsafe action for the control system.
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ST 700 SmartLine Pressure Transmitters User's Manual
Revision 13