SST-ASI-SLC

The Allen-Bradley SLC 500 series controllers (5/03 PLC controllers or higher) use the Allen-Bradley SST-ASI-SLC AS interface scanner for fast and reliable interfacing with field devices and sensors. The SST-ASI-SLC scanner is mounted in Allen-Bradley industrial automation networks to provide data access and the protocol for connecting Allen-Bradley SLC 500 series PLCs with basic binary (on-off) field I/O devices such as feedback sensors, on/off actuators, pushbuttons, rotary encoders, analog inputs, and valve position sensors. The SST-ASI-SLC scanner is able to connect an Allen-Bradley PLC with 2 independent ASI networks that can have 62 nodes (slaves) each. This device supports international standards for this type of data exchange. It can be easily installed and linked to the PLC backplane, and it integrates a power supply and data transmission in 1 single flat cable. The interface supports AS-Interface peripheral fault detection for diagnostic purposes and the handover of analog signal values from peripherals. There are 3 diagnostic LEDs located on the top part of the module to signal the overall status of scanner operations, channel 1, and channel 2.

It only requires a certified ASI power supply. Slave devices on the network (that can have up to 3 outputs and 4 inputs) are cyclically polled. The total cycle time is always less than 10 milliseconds. The brain of the device is the Renesas M16C processor.