B&R 5AP933.215C-00觸摸屏面板
PQM一般狀態字節：LSBit B0：報警條件=1 B1：自檢失敗=1 B2：報警繼電器通電=1 B3：Aux 1繼電器通電=1 B4：Aux 2繼電器通電=1B5：Aux 3繼電器通電+1 B6：未使用MSB位B7：未使用消息格式和示例：從機17請求狀態功能代碼08–環回測試Modbus實施：環回測試PQM實施：環返回測試此功能用于測試通信鏈路的完整性。PQM將響應請求。功能代碼16–存儲多個設定值Modbus實現：預設多個寄存器PQM實現：存儲多個設置值此功能代碼允許將多個設置點存儲到PQM存儲器中。Modbus“寄存器”是16位（兩字節）值，先傳輸高位字節。因此，所有PQM設定值以兩個字節的形式發送。一次傳輸中可存儲的最大設置點數量取決于從屬設備。Modbus允許最多存儲60個保持寄存器。
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.
