You can use the Digital Output block to:
- Establish steady-state conditions using the Initial Value field by automatically sending a value to the hardware the first time SAC processes the block during database initialization.
- Connect to digital devices, such as motor starters, horns, and solenoid valves.
- Assign descriptive labels to digital values through the Open (Labels) and Close (Labels) fields to make them more meaningful to the operator.
- Assist in control situations such as direct digital control when chained to a PID or On-Off Control block.
- Pass values to other blocks through the Next Block field.
- Prevent a write if the value in the driver is the same as the value that is to be written. The DO block will read the bit from the driver and if different, execute the write. If the values are the same, no value is written on this scan.
