Dear all

I had problem that i can not find the way to public Holding register (40101 to 40142) from my Slave to the Master beacause function block Modbus_Slave, Holding register is DB

So how to sent value in DB from 40101 to 40142 via salve ?

Please help me resolve this problem.

Hi!

"When multiple registers (words) are to be transferred, with the "MB_HOLD_REG" parameter the symbolic name of an array, struct or PLC data type that covers the specified data volume of the master (DATA_ADDR and DATA_PTR) must be transferred. The first word of this array, struct or PLC data type corresponds to the MODBUS holding register start address 40001."

how-do-you-establish-a-modbus-rtu-communication-with-step-7-(tia-portal)-for-the-simatic-s7-1200

Kahl

Hi!

"When multiple registers (words) are to be transferred, with the "MB_HOLD_REG" parameter the symbolic name of an array, struct or PLC data type that covers the specified data volume of the master (DATA_ADDR and DATA_PTR) must be transferred. The first word of this array, struct or PLC data type corresponds to the MODBUS holding register start address 40001."

how-do-you-establish-a-modbus-rtu-communication-with-step-7-(tia-portal)-for-the-simatic-s7-1200

 Thank Kahl. I got it