35
OPTION: Digital I/O and Pulse Counters
3
CONNECTIONS
3.1
Digital outputs
The digital outputs are in the form of four normally open relays.
These potential free contacts are accessible on DO1a,b - DO4a,b; see figure.
RELAY SPST
DO a
DO b
Switching Capability:
Power - 30W/50VA
Voltage
- 125V AC/150V DC
Current
- 1.25A AC/DC
3.2
Digital inputs
The figure below shows how the TTL and opto-isolated inputs are
interconnected.
FILTER
OPTO
ISOL.
RECTI-
FIER
DI a
DI b
Px
FILTER
1
2
3
To µ-Processor
