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Chapter 4. WIRING
4 - 12
Connecting External Switch (RSW) Input
The DCP32 is provided with four standard and eight optional external switch inputs.
The optional eight inputs are located on the add-on terminal base. In this case, wire the external switch inputs
across the standard and add-on terminal bases.
Handling Precautions
• The external switch inputs on the DCP32 have built-in power supplies
(open voltage 12 Vdc). Be sure to use no-voltage contacts for external
contacts.
• Use no-voltage contacts such as gold contacts whose small current can
be switched ON/OFF. On some relay contacts, the small current cannot
be switched ON/OFF. Use no-voltage contacts having a sufficient
minimum switching capability with respect to the contact current and
open voltage of the DCP32.
• When using a semiconductor (e.g. open-collector) as a no-voltage
contact, use a semiconductor whose contact terminal voltages at contact
ON are 3V max., and whose leakage current at contact OFF is 0.1 mA.
• External switch inputs on the DCP32, DCP31 and SDC40 series can be
connected in parallel.
When connecting in parallel with other controllers, thoroughly check the
conditions of the other controller before configuring the control system.
23
31
21
22
Standard terminal base
24
25
Contact
Contact
Contact
Contact
RSW1
RSW2
RSW3
RSW4
COM
43
31
41
42
Add-on terminal base
44
45
Contact
Contact
Contact
46
47
48
Contact
Contact
Contact
Contact
Contact
RSW5
RSW6
RSW7
RSW8
RSW9
RSW10
RSW11
RSW12