RKI Instruments M2 Manuel de l'opérateur télécharger pdf (Page 56)

51 M2 Transmitter Operator’s Manual

Figure 28: Recommended Modbus Wiring

Alternate Modbus Wiring For Existing Installations

Although the wiring shown in Figure 28 is recommended, it is possible to wire the M2

into a Modbus system with only 4 wires in situations where a pre-existing system is being

replaced and wiring is already in place. This should only be done if wiring for a system

that is being replaced is already installed and it is not practical to run another wire. See

Figure 29 below for this wiring configuration. In this configuration, the wire between the

“C” terminal on the M2 and the Common terminal on the Modbus controller is omitted.

Instead, the Common terminal on the Modbus controller is connected to the “-” of the 24

VDC power supply.

Figure 29: Alternate Modbus Wiring

C NC NO C NC NO C NC NO

ALARM 2 ALARM 1 FAIL

A B C

RS 485

PWR/SIG

TOXIC OXY

See

Detector

Wiring

24 VDC

Power Supply

Modbus

Controller

Input

Terminals

Common

C NC NO C NC NO C NC NO

ALARM 2 ALARM 1 FAIL

A B C

RS 485

PWR/SIG

TOXIC OXY

See

Detector

Wiring

Addition

M2s

C NC NO C NC NO C NC NO

ALARM 2 ALARM 1 FAIL

A B C

RS 485

PWR/SIG

TOXIC OXY

See

Detector

Wiring

24 VDC

Power Supply

Modbus

Controller

Input

Terminals

Common

C NC NO C NC NO C NC NO

ALARM 2 ALARM 1 FAIL

A B C

RS 485

PWR/SIG

TOXIC OXY

See

Detector

Wiring

Addition

M2s

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 71 72

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RKI Instruments M2 Manuel de l'opérateur Page 56

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