Operation - Mantracourt T24-ACMi-SA User Manual

Operation

The T24 RM1 can accept 8 T24 data inputs for each of the two relays, the total of the inputs compared to the set
point and mode of the relay channel affects whether the relay is energised or not. In addition when considering
the use relays attention should be paid as to what state the system will be in when the power is off. The diagram
below outlines how wiring and normal and inverse modes influence the state of relays.
(COM = Common, NO = Normally Open, NC = Normally Closed)
Relays can change state due to the following events:
Arrival of T24 data from user defined T24 module that causes the relay output to trigger.

Triggering of digital input 1 or 2 (switch input) which if configured reset latched relays

Arrival of data from a specified data tag can reset latched relays.

A change in error state of a module specified in a relays list of inputs

The T24-RM1 also features a third Alarm relay. The Alarm relay is energised from start up, (connection made
between COM and NC). The relay de-energises if an error is detected, an error is classed as a timeout and
optionally can include Integrity error or low Battery. The Alarm Relay will return to normal (energised) once the
source of the error is removed.
Mantracourt Electronics Limited
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T24 Telemetry User Manual