IAI America RCS-C - Manual (Page 59)

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External
power supply
24 VDC
Pin No.
Rectifier
Each input
Internal circuit
External
power supply
24 VDC
Pin No.
Rectifier
Each input
Internal circuit
3.6.4 External I/O Specifications
Input Part
Item Specification
Number of input points 8 points
Input voltage 24 VDC  20 
Input current 7 mA per circuit
Operating voltage
ON voltage --- 16 V min. (4.5 mA)
OFF voltage --- 6 V max. (1.4 mA)
Isolation method Photocoupler
Internal circuit configuration (Standard NPN specification)
 Connect a 24-V power supply between COMIA and COMIB.
 Connect the input common to the negative side of the external power supply.
 Pin Nos. 21 and 22 of COMIA and 23 and 24 of COMIB are connected internally.
Internal circuit configuration (Optional PNP specification)
 Connect a 24-V power supply between COMIA and COMIB.
 Connect the input common to the positive side of the external power supply.
 Pin Nos. 21 & 22 of COMIA and 23 & 24 of COMIB are connected internally.