IAI ssel, Operation Manual

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44
Part 1 Installation
7.5 External I/O Specifications
7.5.1 NPN Specification
(1) Input part
External Input Specifications (NPN Specification)
Item Specification
Input voltage 24 VDC

10%
Input current 7 mA per circuit
ON/OFF voltage
ON voltage --- 16.0 VDC min.
OFF voltage --- 5.0 VDC max.
Insulation method Photocoupler insulation
External devices
[1] No-voltage contact (minimum load of approx. 5 VDC/1 mA)
[2] Photoelectric/proximity sensor (NPN type)
[3] Sequencer transistor output (open-collector type)
[4] Sequencer contact output (minimum load of approx. 5 VDC/1 mA)
[Input circuit]
* P24: I/O interface pin No. 1
Caution
If a non-contact circuit is connected externally, malfunction may result from leakage current.
Use a circuit in which leakage current in a switch-off state does not exceed 1 mA.

SSEL controller’s input signal
At the default settings, the system recognizes the ON/OFF durations of input signals if they are
approx. 4 msec or longer. The ON/OFF duration setting values can also be changed using I/O
parameter No. 20 (input filtering frequency).
Internal circuit
Input terminal
External power
supply 24 VDC

10%
ON duration
OFF duration
P24*
+
-
560

3.3 K
