Millennium Enterprises AD-ST1400-25, MLP-A/AR user manual RS-485 Communication, Terminal Board

Net Safety Monitoring Inc

Figure 5: Wiring—Controller and Sensor

Terminal Board

RST

+24V

COM

RST
+24V
	Power
COM
4-20	Terminals
ISO

SENSOR AND CONTROLLER

WARNING:

Power to the unit must be OFF before wiring.

Note: The Sensor may be factory installed to the Controller. If so, you need only connect the Power Terminals.

1.Remove the Controller’s Housing Cover.

2.Connect the Sensor to the Sensor Terminals (if necessary) and the Output Terminals to the output signal wires.

Table 1: Controller/Sensor Connections

		4-20
A		ISO
B	Modbus RTU	Red+
COM	Terminals	Blk
-	to PLC
		Shld

Red

Blk

-Sensor

- Terminals

Shld

Sensor Board Terminals

Sensor		Controller
Wire		(Sensor Board)
Red	=	Red (+24 V)
Black	=	Blk (Sig)
		-
		-
Shield	=	Shld

Terminal Board Power

Controller		Power
(Terminal Board)		Connections
RST	=	Remote Reset
+24V	=	Power (+)
COM	=	Power (-)
4-20	=	Current Loop
		Output
ISO	=	+24 V isolated
		4-20 power

Sensor Board

Sensor Wires

Note: For Sensor Separation instructions, see Figure 6, "Wiring—Sensor Separation", on page 7.

3.Replace the Controller’s Housing Cover.

4.Turn Controller On.

5.Ensure display reads Start Delay , Status LED is Red Slow Flash and current output displays 3.0 mA. This is the start-up delay sequence which will last approximately 90 seconds.

RS-485 Communication

Connect devices in a chain via the Modbus terminals. The last device in the chain requires end of line termination (refer to "MODBUS Termination" on page 9).

Note: If the 4-20 mA signal is not used, connect a jumper between the 4-20 terminal and the COM terminal on the Terminal Board.

MLP-A/AR/AD-ST1400-25 6