Background: The architecture of the control system for the solid fuel molten-salt reactor (TMSR-SF) is based on the ABB’s 800XA series programmable logic controller (PLC) hardware. The 800XA series PLC is widely used in the power industry due to its unique reliable design

but there is a lack of step motor controller which is the key component for control rod drive mechanism (CRDM). Purpose: This study aims to configurate a ABB AC500 step motor controller CD552 into the 800XA series PLCs to realize stepper motor driven pulse output and position detector inputs decoding. This is a key module for reactor Rod Control and Position Indicator (RCPI) system. Methods: The Proifbus-DP interface of the 800XA series PLCs is adopted to connect the step motor controller CD522 via its CDI 542 module. The plug and play (P&P) functionality of CD552 is achieved and optimized to work coherently based on Proifbus-DP. During the configuration of the controller

by a flexible input and output registers assignment

it not only achieves custom controller function

but also simplifies the subsequent library programming. Results: Two main functions of RCPI were implemented with a very low failure rate at the level of 8×10?6 by analyzing of the reliability of the hardware’s configuration based on CD522. Conclusion: Such kind of hardware configuration and software optimization can meet various performance parameters of the RCPI system

such as travel stroke

speed control required accuracy and position detection precision

etc. Abstract