User manual
Publication CIG-WD001B-EN-P - May 2005
5-2 1746 I/O Modules
Input and Output Connections
A
A
B
B
Z
Z
A(+)
A(-)
B(+)
B(-)
Z(+)
Z(-)
1 2 3 4
+VDC
COM
VS
GN D
cab le
(1)
Belden 9503 or equivalent
305m (1000ft) max length
Power
Supply
Earth
Shie ld
(2)
SW1
ON
OFF
(all switches ON)
A
A
B
B
Z
Z
Allen-Bradley
845H Series
differential
encoder
Module Inputs
encoder connector
housing
Differential Encoder Output Waveforms
The figure below shows the different encoder output waveforms. If your encoder matches these
waveforms, the encoder signals can be directly connected to the associated screw terminals on
the module. For example, the A lead from the encoder is connected to the module’s A+ screw.
If your encoder does not match these waveforms, some wiring modifications may be necessary.
See the High-Speed Counter Module User Manual, publication 1746-6.5 for a description of
these modifications.
1. Refer to your encoder manual for proper cable type and length.
2. Due to the topology of the module’s input circuits, terminating the shield at the encoder end
provides the highest immunity to EMI interference. Connect EARTH ground directly to the encoder
connector housing.
Discrete Output Wiring
The user must supply
the external VDC.
Terminal Wiring
max. #14 AWG (2mm2)
max. 2 wires per terminal
max. torque: 0.9Nm (8 in-lbs)
Limit Switch and
Encoder Input Wiring
Lower Retaining Screw Maximum
Torque = 0.7 to 0.9 Nm (6 to 8 in-lbs)
Upper Retaining Screw Maximum
Torque = 0.7 to 0.9 Nm (6 to 8 in-lbs)
1746-HSCE Differential Encoder
+
-
321
Hard Contact Limit Switch
JW 1
Jumper placed for
10 ms filtering
Do not connect LS (5V dc) or LS
(12V dc) Terminals
12V dc
VS
COM
LS (24V dc)
LS (12V dc )
LS (5V dc )
LS COM
Input and Output Connections
1746-HSCE module
Connect only one LS input range at a time,
or the module will be damaged.
Discrete Output Wiring
The user must supply
the external VDC.
Terminal Wiring
max. #14 AWG (2mm2)
max. 2 wires per terminal
max. torque: 0.9Nm (8 in-lbs)
Limit Switch and
Encoder Input Wiring
Lower Retaining Screw Maximum
Torque = 0.7 to 0.9 Nm (6 to 8 in-lbs)
Upper Retaining Screw Maximum
Torque = 0.7 to 0.9 Nm (6 to 8 in-lbs)
1746-HSCE Limit Switch (12V dc Hard Contact)