User Manual

21
Copyright 2010 Unitech Electronics Co., Ltd. All rights reserved. Unitech is a registered trademark of Unitech Electronics Co., Ltd.
Using the Terminal Block
The MT688 provides two 12-position
terminal blocks for input/output signals.
Insert the wire’s stripped end into the
desired terminal block position. Tighten
the lock screw to secure the wire.
Terminal Block Pin Assignment
J2 Terminal Block Port
Pin Name Description Pin Name Description
1 D1+ Photo-IN Anode (+) 7 D4+ Photo-IN Anode (+)
2 D1- Photo-IN Cathode (-) 8 D4- Photo-IN Cathode (-)
3 D2+ Photo-IN Anode (+) 9 PLC TX PLC TX
4 D2- Photo-IN Cathode (-) 10 PLC RX PLC RX
5 D3+ Photo-IN Anode (+) 11 12V External DC 12V input
6 D3- Photo-IN Cathode (-) 12 GND GND
J3 Terminal Block Port
Pin Name Description
1 R1-C Relay 1 Common
2 R1-NO Relay 1 Normal Open
3 R1-NC Relay 1 Normal Close
4 R2-C Relay 2 Common
5 R2-NO Relay 2 Normal Open
6 R2-NC Relay 2 Normal Close
7 R3-C Relay 3 Common
8 R3-NO Relay 3 Normal Open
9 R3-NC Relay 3 Normal Close
10 R4-C Relay 4 Common
11 R4-NO Relay 4 Normal Open
12 R4-NC Relay 4 Normal Close