BENTLY 136719-01 Station Holding Register

BENTLY 136719-01 serves as the Modbus master station, with the Modbus address consistent with the address in the PLC manual, such as the MBUS of S7-200 serving as the master station_ The MSG instruction is used to send request messages to the Modbus slave and process response messages returned by the slave. When reading the address area starting from I0.0 of the slave station (another BENTLY 136719-01), its input parameter Addr (Modbus address) is 10001. When the starting address of the V storage area of the BENTLY 136719-01 slave station holding register is VB200, the address of the holding register is 40001 when reading the V storage area starting from the slave station VW200.

The programmers of computer software (such as DCS or configuration software) for BENTLY 136719-01 need to write programs to implement Modbus communication, and first need to determine the message structure of Modbus RTU. They are generally not familiar with PLC, so PLC programmers often need to discuss the message structure of Modbus with the programming personnel of the upper computer software. The Modbus address provided in the BENTLY 136719-01 manual is the same as the address used by Modicon and GE PLCs, and is based on a 1 address, which means the first address of similar components is 1. BENTLY 136719-01 uses a zero based address, which means the first address of similar components is 0. The Modbus address of BentlyPLC in the Modbus message also uses a zero based address.