This digital output module provides four logic outputs and is available in two factory option formats for standard or high-current output.

The DO8 provides higher packing density and lower cost per channel.

The eight digital output module provides eight logic outputs, which are typically used for control, alarms or events outputs.

Each channel a 24V output with 0.75A capability (subject of a maximum of 4A total per module) can be used for driving solenoids, relays, lamps, fans, thyristor units, single phase Solid State Relays (SSRs) or some three phase SSRs.

This digital output module provides four relay outputs. The relay contacts are all fitted with removable snubber circuits to reduce contact arcing and prolong contact life.

No of channels	4 (3 normally open + 1 changeover)
Max current rating	2A at up to 240V ac; 0.5A at 200V dc, increasing to 2A at 50V dc resistive
Min ratings	AgCdO contacts offer best operating life switching more than 100mA 12V
Fuse	3.15A, 20mm ceramic, time lag (T)
System isolation	Reinforced, 264V ac max
Channel insulation	Functional, 264V ac max
Contact Life	>10million operations @ 250V ac, 1A rms
	>600,000 operations @ 250V ac, 2A rms
De-rating	The above ratings summarize the performance with resistive loads. With complex loads further derating may be required
AC Voltage As the AC load becomes more “difficult” a more significant de-rating factor is required. The graph opposite shows the de-rating to be applied in terms of contact life, assuming the load requirement is pre-defined. F1 Worst case F2 Typical DC voltage DC operation is also limited for difficult loads, particularly where there is significant inductance. Here the working current must be limited as shown, where the load time constant (L/R, in ms) is the significant factor.