Description
Product details:
To design a redundant Profibus I/O control system with the ControlLogix architecture, the SST-PFB-CLX card must be installed in a remote ControlLogix rack. In this setting, it communicates with the ControlLogix cpu via the ControlNet bridge card of the 1756-CNB series.
While the SST documentation explains how to set up the Sst-PFB-Clx card and ControlLogix CPU to communicate through the local rack, no SST documentation describes how to use the card remotely (as required for redundant systems).
According to document 1756Soft_HBU.pdf, applying the solution “Software Output System” (publication number 1756-AP001A-US-E), you can build ControlLogix redundant systems without the 1757-SRM module, using stepwise logic to switch controls between cpus.
The SST™ communication module connects to a Rockwell SLC 500 plc as a master or slave scan or to simulate PROFIBUS DP I/O. Using a user-defined data space of 2064 bytes for input and 2064 bytes for output, the SST™Profibus module provides a cost-effective solution for connecting SLC cpus to large cpus in a fieldbus network.
A 9-pin serial port is included on the scanner to allow firmware upgrade fields and upload I/O configurations.
SLC’s processor logic scan and PROFIBUS I/O scan are independent of each other. The SLC processor reads the scanner input data input scan during its run and writes the output data during its output scan. The scanner reads input data from the slave and writes output data to the slave independently of what the SLC is doing. Slave status, diagnostic status All slave, network diagnostic counters, and DP Master information diagnostic counters are maintained by the scanner. The scanner does not need to set up a g file in SLC.
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