Purpose
The Multistate Digital Input (MDI) block provides a means of monitoring the state of one, two, or three related digital inputs. The block produces a raw input value (0 - 7) based on digital values it receives from an I/O driver or OPC server every time the Scan, Alarm, and Control (SAC) program scans the block.
Features
The Multistate Digital Input block:
- Is a primary block.
- Can be used as a stand-alone block.
- Provides more detailed information about a device than a Digital Input block.
- Generates alarms when values are outside of defined limits.
- Receives values from up to three driver I/O addresses or OPC servers.
- Receives values from Program blocks or from Easy Database Access programs.
- Can be used in a chain with exception-based or time-based processing.
