Detailed Description
2.12 Block descriptions
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-175
Error and operational messages are provided by the user in data block DB 2.
Note
In DB 2, a "1" signal must be present for several OB1 cycles to ensure that a message can
also be displayed on the HMI. There is an upper limit for the number of interrupts and
messages that can be pending at the same time. This upper limit is dependent on the PLC
CPU. On PLC 317-2DP, the upper limit for messages pending simultaneously is 60.
Declaration of the function
STL representation
FUNCTION FC 10: Void
// NAME: AL_MSG
VAR_INPUT
ToUserIF : BOOL ;
Ack : BOOL ;
END_VAR
END_FUNCTION
Description of formal parameters
The table below lists all formal parameters of the AL-MSG function.
Signal Type Type Value range Remarks
ToUserIF I Bool 1 = Transfer signals to user
interface every cycle.
Ack I Bool 1 = Acknowledge error messages.
Call example
CALL FC 10 ( //Error and operational messages
ToUserIF := TRUE, //Signals from DB 2 are transferred
//to interface
Ack := I6.1); //Acknowledgment of
//error message carried out via
//input I6.1
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