Connecting Outputs To A Plc Or An Isolation Amplifier - Honeywell EK280 Applications Manual

EK280

6.9 Connecting outputs to a PLC or an isolation amplifier

i
When connecting the outputs to a customer system (e.g. PLC) galvanic separation of both
systems is strongly recommended. Especially when using or connecting the EK280 to a
hazardous area (hazardous area 1), an external isolation amplifier (permitted for use in
hazardous areas) or usage of the FE260 is required.
i
A galvanic separation is also recommended outside the hazardous area to exclude
disturbances of the systems with each other. This can be carried out separately for each
output via the internal slide switch. Alternatively, an external cut-off relay.
i
In particular, when connecting more than one output to a PLC, it must be taken into
consideration that under normal operating conditions all 4 outputs have a common earth.
Inputs on a PLC often have a common "plus" contact so that all outputs can be switched in
parallel.
Impossible interconnections of
outputs to a PLC or an isolation
amplifier with more than one input and
a common plus potential in the device
connected downstream:
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