# Control Block Bits

The Control bit block defines all bit-type signals for any action that the PLC/MC might initiate. The Control bit block is 80 bits, and is read by the SLMP scanner for bit-state changes at the user-specified rate configured with the Poll Interval (ms) property. The Poll Interval (ms) property is on the Settings tab of the Industrial Ethernet configuration window in In-Sight Vision Suite. Some of the bits are reserved.

The usage and reservation of the Control block bits are summarized in the table.

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

Byte | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0
--- | --- | --- | --- | --- | --- | --- | --- | ---
0 | Set Offline | Reserved | Execute Command | Inspection Results Ack | Buffer Results Enable | Trigger | Trigger Enable
1 | Reserved
2 | Reserved | Clear Exposure Complete | Clear Error | Initiate String Command | Set User Data
3 | External Event 7 | External Event 6 | External Event 5 | External Event 4 | External Event 3 | External Event 2 | External Event 1 | External Event 0