User manual

890 USE 145 00
512/612 Modicon Micro PLCs
33
Circuit Characteristics
Simplified schematic
Field
side
Logic
side
5 V
Varistor 280 VAC
Isolation
Channel-to-bus 1780 VAC, 2500 VDC
Group-to-group 1780 VAC, 2500 VDC
Mechanical operating cycles 20,000,000
Surge withstand capability 4 kV
Response times
ON®OFF 10 ms
OFF®ON 10 ms
Maximum wire length 100 m
Wire size
One wire 14 AWG
Two wires 20 AWG
Using Relay Outputs with Inductive
Loads
The mechanical relay outputs in Micro controllers must be provided with additional
protection when connected to an inductive load. Properly suppressing inductive
loads reduces radiated noise and prolongs the life of the relay contacts. The follow-
ing three figures provide examples of how to suppress various inductive loads.
Inductive
AC Load
OUTPUT
COMMON
*Minimum voltage rating of 200 VAC.
* *
0.47 mf
50 W
115 AC
SOURCE