# Output Block Words

The Output word block is an output of the vision system and an input to the PLC/MC. It is read whenever the Set User Data bit changes from 0 to 1, or whenever a job change occurs. The usage of the Output block words is summarized in the below table.

Note: For a detailed description of the signals, see the Industrial Communications Signals topic.

............16-bit Word | Signal
0 .. 1 | Command ID. The available IDs are as follows: Current Job ID: 0x0000: Command succeeded / Unknown failure 0x0002: Bad command (invalid Command ID, or the specified job number does not exist). 0x208D: Request is incompatible with system state (that is, whether Processing is enabled or not). For example, this output may be returned when you attempt a job change without disabling Processing first. The state of Processing is indicated with bit 6 of byte 0 in the Status bit block.
2 .. 3 | Error Code
4 .. 1920 | Command Result Code