FUNCTION_BLOCK DM2_Read EXTENDS DM1_Read
This function block reads DM2 messages from a given device (itfSourceECU) as long as xEnable is TRUE. In principal a DM2 message contains lamp information and all previously active diagnostic trouble codes (DTC). Following information is provided by this function block:
Lamp information for following lamps:
Malfunction Indicator Lamp(MIL)
Red Stop Lamp (RSL)
Amber Warning Lamp (AWL)
Protect Lamp
Number of previously active DTCs(output: udiDTCCount)
Information about if DM2 message was received in the current PLC cycle (xReceived).
For detailed information about received DTC data one or more DTC Handlers can be connected with this function block (optionally). For example:
DTCBufferWriter : Writes DTC data to a given memory buffer
DTCLogger : Writes DTC data to the PLC log.
InOut:
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Scope |
Name |
Type |
Initial |
Comment |
Inherited from |
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Input |
xEnable |
BOOL |
TRUE: Action starts FALSE: Action stops, outputs xDone, xBusy, xError are resetted |
LTrig |
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Output |
xDone |
BOOL |
TRUE: Action successfully completed |
LTrig |
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xBusy |
BOOL |
TRUE: Function block active |
LTrig |
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xError |
BOOL |
TRUE: Error occurred, function block aborts action FALSE: No error |
LTrig |
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Input |
itfSourceECU |
IJ1939RemoteECU |
ECU which sends this message |
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Output |
itfDTCHandlerList |
IDTCHandlerList |
THIS^ |
mainly for graphical programming: output for optional connection to DTC Handler |
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udiDTCCount |
UDINT |
Contains number of received Diagnostic Trouble Codes. |
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MalfunctionIndicatorLamp |
Malfunction Indicator Lamp: Lamp to indicate when there is an emission related trouble code active. |
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RedStopLamp |
Red Stop Lamp: Lamp to indicate a problem that is severe enough to warrant stopping the vehicle. |
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AmberWarningLamp |
Amber Warning Lamp: Lamp to indicate a problem with the vehicle system but the vehicle does not need to be stopped immediately. |
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ProtectLamp |
Protect Lamp: Lamp to indicate a problem with a vehicle system that is most likely not electronic subsystem related (e.g. Coolant Temperature has exceeded its defined range.) |
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xReceived |
BOOL |
If a DM message was received xReceived is TRUE for one cycle. |
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eError |
detailed error information if xError is TRUE |
