Rockwell Automation 937CU-AIHLP-DC1 HART Loop Converter Installation Instructions - Manual (Page 39)

Bul. 937C HART Loop Converter Installation Instructions
You can implement the following applications:

Switching direction max, direction of operation active: alarm if there is a trip value
overrange, e. g., sounder on

Switching direction max, direction of operation passive: switch off during trip value
overrange, e. g., pump, heating, ... off, for larger hysteresis Min-Max operation
(pump, heater, ... on/off)

Switching direction min, direction of operation active: alarm if there is a trip value
underrange, e. g., sounder is on.

Switching direction min, direction of operation passive: switch off during trip value
underrange, e. g., pump, heating, ... off, for larger hysteresis Min-Max operation
(pump, heater, ... off/on)
The exact switching characteristics of the device are shown in the following illustration:
Value
Max – hysteresis
Max
Min + hysteresis
Switching direction max, mode active:
energized
de-energized
Switching direction max, mode passive:
energized
de-energized
Switching direction min, mode active:
energized
de-energized
Switching direction min, mode passive:
energized
de-energized
Min
Time
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