39ACM24BEN | 16139-215/1 Siemens ACM+ Advanced Control Module

161392151ADVANCED CONTROL MODULE ACM+ 4MB APACSThe Modbus Function Block (FB) Libraries permit the control module and the APACS/QUADLOG systemto exchange data with foreign devices that use the Modbus RTU protocol. The Modbus RTU protocol isused by AEG Schneider Automation (formerly Modicon/Gould) RTU programmable logic controllers (PLCs)and by many types of specialty instruments and interfaces such as analyzers, chromatographs, weigh scales,human-machine interfaces (HMIs), remote termination units, and other distributed control systems (DCSs).Modbus is a master/slave protocol in which a single master can address multiple slaves. The slave devices donot initiate any communication; they wait for a command from the master, which requests the slave to read orwrite data values. The control module can be configured to be either the master or the slave, but not bothfrom the same port