B&R 5AP933.215C-00触摸屏面板
PQM一般状态字节：LSBit B0：报警条件=1 B1：自检失败=1 B2：报警继电器通电=1 B3：Aux 1继电器通电=1 B4：Aux 2继电器通电=1B5：Aux 3继电器通电+1 B6：未使用MSB位B7：未使用消息格式和示例：从机17请求状态功能代码08–环回测试Modbus实施：环回测试PQM实施：环返回测试此功能用于测试通信链路的完整性。PQM将响应请求。功能代码16–存储多个设定值Modbus实现：预设多个寄存器PQM实现：存储多个设置值此功能代码允许将多个设置点存储到PQM存储器中。Modbus“寄存器”是16位（两字节）值，先传输高位字节。因此，所有PQM设定值以两个字节的形式发送。一次传输中可存储的最大设置点数量取决于从属设备。Modbus允许最多存储60个保持寄存器。
PQM General Status Byte: LSBit B0: Alarm condition = 1 B1: Self test failure = 1 B2: Alarm relay energized = 1 B3: Aux 1 relay energized = 1 B4: Aux 2 relay energized = 1 B5: Aux 3 relay energized = 1 B6: Not used MSBit B7: Not used MESSAGE FORMAT AND EXAMPLE: Request status from slave 17 Function Code 08 – Loopback Test Modbus Implementation: Loopback Test PQM Implementation: Loopback Test This function is used to test the integrity of the communication link. The PQM will echo the request.Function Code 16 – Store Multiple Setpoints Modbus Implementation: Preset Multiple Registers PQM Implementation: Store Multiple Setpoints This function code allows multiple Setpoints to be stored into the PQM memory. Modbus "registers" are 16 bit (two byte) values transmitted high order byte first. Thus all PQM setpoints are sent as two bytes. The maximum number of Setpoints that can be stored in one transmission is dependent on the slave device. Modbus allows up to a maximum of 60 holding registers to be stored.
