Obsolete instruction
Use this instruction to write data from a master to a slave or read data from a slave via the communication port using the Modbus RTU protocol, as defined in the system registers of the port used.
This instruction is allowed to be compiled because of the down-compatibility to lower versions but cannot be selected in the [Instructions] pane anymore. It will be replaced by: FP_MODBUS_MASTER 将数据写入从站或从从站中读取