Sensor Output & Modbus Connections; Mgs-402 Gas Detection Controller Network - Bacharach MGS-402 User Manual

Gas detection controller for commercial & industrial applications

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MGS-402 User Manual

5. Plug the power terminal block back into the printed circuit board (PCB).

Figure 3-1 -

3.6 Sensor Output & Modbus Connections

The MGS-402 Modbus communications network is connected to the MGS-410 gas detectors using a shielded

twisted pair instrument cable (Belden 3106A or equivalent). The same type of cable can be used for power

connection when using the MGS-402 controller as the power source (+24VDC) for the MGS-410 gas sensors

and standard Modbus network limits. Care needs to be taken to account for voltage drops between the

controller and the MGS-410 gas sensors and standard Modbus network limits. The furthest distance the

MGS-410 can be from the MGS-402 controller is 1000ft (305m) when using 20 - 16AWG conductors for the

sensor power and Modbus connections.

3.6.1.1 Connecting the +24 VDC Terminal Block:

When using the MGS-402 as the +24VDC power source of the MGS-410 gas sensors the power should be

connected the following manner.

1. Locate the +24 VDC terminal block in the MGS-402 controller (item 11 in "Figure 2-3 - MGS-402

Layout" on page 7).

2. Using Belden 3106A or equivalent control wire feed through one of the available cable glands

and connect the '+' and '-' terminals to the appropriate terminals in the MGS-402.

Power Terminal Block

NOTE: Refer to the MGS-410 User Manual or QSG for location and connection of the

corresponding +24 VDC terminal block in the MGS-410 gas sensor.

1100-2570 Rev 1

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