AH500 Module Manual 8.8 Error Flags The error flags and the UD Link statuses are stored in data registers. Users can modify the input device range by themselves. 8-64 Data register Description D0 Error code D1 Hardware failure D2 An error occurs when the communication protocol for exchanging data through COM1 is UD Link. D3 An error occurs when the communication protocol for exchanging data through COM2 is UD Link. D4 An error occurs when the communication protocol for exchanging data through COM1 is Modbus. D5 An error occurs when the communication protocol for exchanging data through COM2 is Modbus. D6 An error occurs when data is exchanged through COM1.
D7 An error occurs when data is exchanged through COM12 D8 Internal communication error D9 The group which is triggered when the communication protocol for exchanging data through COM1 is Modbus D10 The group which is triggered when the communication protocol for exchanging data through COM2 is Modbus D11 The command which is executed when the communication protocol for exchanging data through COM1 is UD Link D12 The command which is executed when the communication protocol for exchanging data through COM2 is UD Link D13 The packet which is sent/received when the communication protocol for exchanging data through COM1 is UD Link D14 The packet which is sent/received when the communication protocol for exchanging data through COM2 is UD Link D15 Reserved D16 Reserved D17 Reserved