16-Point Vac Discrete Input Module

A separate connection to L1/+Vdc is needed when the module is used in an ungrounded ac control circuit. Input operation is unaffected by this connection. However, for ungrounded ac systems using ground fault detection circuitry, this connection balances the system and prevents erroneous ground fault indications.

Module Specifications:

POINT INPUTS 16
POINTS PER COMMON 16
NOMINAL VOLTAGE 115 Vac
VOLTAGE RANGE 90-140 Vac
CURRENT RANGE 6-24 mA (15 mA at 115 Vac typical)

SWITCHING LEVEL
Logic 1 - (75 Vac)
Logic 0 - (43 Vac)
ALLOWABLE
LEAKAGE CURRENT - (1.5 mA ac )
INPUT DELAY
Off to On - 2.4 ms +/-25%
On to Off - 30 ms +/-50%
OPERATING CURRENT
+ 5 Vdc=54 mA max.
INPUT SURGE
CURRENT LIMIT - 500 mA per input

The 621-1151 has been superseded by the 621-1160RC.