Alspa CE80–20 FIP Bus Interface Unit User's Manual

Operation6. I/O DATAThe Bus Interface Unit stores I/O data, as well as additional data representing forced conditions and “validator”status, in separate memory areas.Data DescriptionData Type Displayed onHHPAlspa C80–75 PLC DataTypediscrete input states I %Idiscrete output states Q %Qanalog input values AI %AIanalog output values AQ %AQdiscrete input validatorsoutput validatorsanalog input validatorsanalog output validatorsFault/No Fault ContactsIn the Bus Interface Unit, the I/O state and validator tables contain the input and output data.If the Bus Interface Unit detects a problem while reading a module’s inputs, it sets to ”invalid” all InputValidators for that module.If output validators for outputs received from the network are “invalid”, those outputs will be defaulted or holdlast state.Displaying Data with a Hand–Held ProgrammerThe Hand–Held Programmer can read data directly from the Bus Interface Unit. If the Bus Interface Unit is in Idle,Ready mode or Run Unlocked mode, the Hand–Held Programmer can also force the states of I/O data.Page 3–6Alspa CE80–20 FIP Bus Interface Unit User’s ManualALS 52311 b–en