Connecting
5.5 Integrating the FC410 with Modbus system
FC410 with Modbus
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Operating Instructions, 02/2016, A5E33120874-AC
NOTICE
Flameproof conduit seals
Two flameproof conduit seals are required for each device in hazardous area installations,
one on DSL and one where cables leave hazardous area..
NOTICE
Equipment approved for hazardous locations
Ensure that the equipment is approved for installation in hazardous locations.
5.5.2
Wiring FC410 to the Modbus system
FC410 is slave in a 2-wire Modbus RTU RS 485 bus system. Terminal A on the FC410 must
be connected to terminal A on the master/host system. Terminal B on the FC410 must be
connected to terminal B on the master/host system This corresponds to a half-duplex
communication where the slave will only reply to a request from the master.
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This example shows an EMC shielded enclosure for multidrop installation where the
connection includes signal and power. Cable shield must be grounded at host system, in
connection box, and at flowmeter to comply with EMC requirements. Keep the cable
shield to the ground as short as possible.
Siemens can supply suitable cable (gray) for non-hazardous area installations in required
lengths to be ordered with the system. The cables can be ordered with M12 plugs on both
ends or without plug.