User manual

890 USE 145 00
512/612 Modicon Micro PLCs
31
Dedicated High-speed Interrupt Inputs
Electrical Characteristics
ON level 15 ... 30 VDC
OFF level 0 ... 5 VDC
Minimum ON state input 6 mA @ 15 VDC
Maximum OFF current 0.3 mA @ 5 V
Maximum input impedance 15.8 kW when OFF
1.95 kW when ON @ 24 VDC
Current draw 12.3 mA @ 24 VDC
Note We recommend the use of three-wire proximity switches on these inputs.
Circuit Characteristics
Simplified schematic
Logic side
V
CC
Field
side
Isolation
Method Opto-coupler
Channel-to-bus 500 VDC
Maximum cable length 50 m
Required cable type Shielded twisted pair, for noise immunity
Wire size 20 AWG
Interrupt voltage level To assure reliable system operation, interrupt
voltage must be brought from OFF to ON and
maintained ON for 350 ms minimum—any
pulse duration < 50 ms is filtered