Definition:
Smart Logic Modules are programmable safety devices with embedded diagnostics and communication capabilities. This would be the Logic Solver in your SIS. This would be an example more complex than relay logic but less complex than a Safety PLC Control Panel. Consider it a middle ground.
Note this is somewhat of a loose term popularized by Moore.
This is an excellent choice for a SIS with only a few SIFs as you do not need a full control panel (with a smart PLC, input cards, power supply, cabling and all that). You also do not have to manage the programming of the PLC as that is all done via settings in the Smart Logic Module.
Key Points:
- Item is not programmable, but is able to be “setup”
- Relatively new product
- Moore SLA is an example
Example:
A SIS has three SIFs. The Designers decide that a Safety PLC is too expensive and is more than what they need. They consider relay logic or a Smart Logic Module. They ultimately decide on a Smart Logic Module because it gives them equivalent alarming features, is configurable, and substantially less expensive.
See also: Logic Solver, Safety PLC
Cited Source:
- IEC 61508-2:2010.
- Moore SLA