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65-2640RK-03 M2A Transmitter Operator’s Manual
Appendix B: PLC and DCS Device Wiring
The M2A can be wired to a PLC or DCS device if desired.
1. Guide multi conductor shielded cable or cables or wires in conduit through the top conduit hub of the
junction box. The number of cables or wires needed will depend on whether any relays are used and whether
the Modbus output is used. Use the following recommendations to determine how to wire the M2A:
•
If Modbus connections will not be used and only the PWR/SIG terminal strip connections will be used,
use four conductor shielded cable or four wires in conduit for connections to the power/signal terminal
strip.
•
If the PWR/SIG terminal strip connections and one or more relays are used, route the connections to the
M2A in conduit. Use shielded cable in the conduit for the PWR/SIG connections and unshielded cable
or individual wires for the relay connections. Make sure any wire or cable used for relay wiring is
appropriately rated for the power that it will carry.
NOTE:
If shielded cable is used for the PWR/SIG connections, leave the cable shield’s drain wire insulated
and disconnected at the M2A. You will connect the opposite end of the cable’s drain wire at the
controller or device.
•
If the M2A will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus Output” on page 40.
Table 15: Wire Size for PWR/SIG Connections
Max Distance to Controller
w/18 Gauge Wire
Max Distance to Controller
w/16 Gauge Wire
Max Distance to Controller
w/14 Gauge Wire
2,500 ft.
5,000 ft.
8,000 ft.
