6 WIRING
6.5 Input Wiring
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6
6.5 Input Wiring
The input wiring of the CPU module and I/O modules is explained below.
24 V DC input (Sink and source input type)
For input specifications of the CPU module, refer to Page 19 Input Specifications.
For input specifications of the I/O modules, refer to Page 135 Input specifications.
Sink and source input
■Differences between the sink input circuit and the source input circuit
■Switching between sink/source inputs
To switch the input type to sink or source input, wire the [S/S] terminal to the [0V] or [24V] terminal.
• Sink input: Connect the [24V] terminal and [S/S] terminal. (Page 87 Sink input [AC power supply type])
• Source input: Connect the [0V] terminal and [S/S] terminal. (Page 88 Source input [AC power supply type])
All inputs (X) of the CPU module can be set to either sink input or source input by selection.
• Sink input [-common] • Source input [+common]
Sink input means a DC input signal with current-flow from the input
(X) terminal.
When a device such as a transistor output type sensor is
connected, NPN open collector transistor output can be used.
Source input means a DC input signal with current-flow into the
input (X) terminal.
When a device such as a transistor output type sensor is
connected, PNP open collector transistor output can be used.
24V
N
L
X
S/S
0 V
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