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PLC Support Software at Jefferson LabSeveral Automation Direct (DirectNet) Programmable Logic Controllers (PLCs) have been integrated into the accelerator control system at Jefferson Lab. The integration is based on new software that consists of three main parts: a PLC driver with a state machine control block, a device support module, and a common serial driver. The components of new software and experience gained with the use of this software for beam dump systems at Jefferson Lab are presented. Authors: P. Chevtsov, S. Higgins, S. Schaffner, D. Seidman
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