![]() ![]() For a complete list of the registers, see the tables at the end of this document. All other output status coils will return their status in the same fashion. If the motor is shut down Coil 0200 H will be set if it has been requested to start, Coil 0200 H will be clear. The first “coil” of this block reflects the state of the motor contactor or RUN state of the controller. READ OUTPUT COIL STATUS (FUNCTION CODE 01) Digital output states are read by the host via Function Code 01, "Read Output Status". For a complete list of register address, refer to table 1 through 4 in this manual. All numeric values shown in the function code request and response examples are in hexadecimal (base 16) format, even when not denoted with an “H”.įUNCTION CODE SUPPORT This portion of the document provides examples of each MODBUS function code that is supported by the GCS controllers. It is intended to be used in conjunction with the Modicon Modbus protocol definition and applies to GCS (Graphic Control System) system controller software revision 6.44 or higher. Specifically, the supported Modbus function codes are: Read Output Coil Status : Function Code 01 Read Input Status: Function Code 02 Read Output Registers: Function Code 03 Read Input Registers: Function Code 04 Force Single Coil: Function Code 05 Preset Single Register: Function Code 06 Write Multiple Coils: Function Code 15 Write Multiple Output Registers: Function Code 16 This document describes the supported functions and the response to each valid request from the host. INTRODUCTION The Graphic Control System products support a subset of the functions of Modicon Modbus Protocol in RTU (or binary) format as described in Modicon Modbus Protocol Reference Guide PI-MBUS-300, Rev C, dated January 1991. All modules within the GCS group utilize the same register address map to facilitate exchanging model types with minimal disruptions to the central SCADA system’s configuration. OVERVIEW This document provides the technical specifications of the Modbus RTU protocol support included with all Centrilift’s Graphic Control System (GCS) control units. 7 WRITE MULTIPLE OUTPUT REGISTERS (FUNCTION CODE 16). 6 WRITE MULTIPLE COILS (FUNCTION CODE 15). 6 PRESET SINGLE REGISTER (FUNCTION CODE 06). 5 READ INPUT REGISTERS (FUNCTION CODE 04). 4 READ OUTPUT REGISTERS (FUNCTION CODE 03). ![]() Graphic Control System (GCS): MODBUS PROTOCOL SUPPORT Revsion 2.0 - March 2003 ![]()
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