Detailed description
2.14 Programming tips with STEP 7
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
253
2.13.4 Message signals in DB 2
General
DB 2 allows the user to display the messages for individual signals on the operator panel. As
the lists of interface signals show, signals are divided into predefined groups. When a
message occurs, disappears or is acknowledged, the number entered in the message
number column is transferred to the HMI. Text can be stored in the HMI for each message
number.
References:
/LIS2/ Lists (Book2), see Section "PLC-Messages (DB 2)".
/IADC/ Commissioning Manual, Alarm and Message texts "Alarm text-files for HMI-
Embedded or for HMI-Advanced".
Note
The number of user areas can be parameterized via FB 1.
After the configuration has been modified (FB 1: MsgUser), DB 2/3 must be deleted.
2.14 Programming tips with STEP 7
2.14.1 General
General
Some useful tips on programming complex machining sequences in STEP7 are given below.
This information concentrates mainly on the handling of data type POINTER and ANY.
Detailed information about the structure of data types POINTER and ANY can be found in
Chapter "CPU register and storage of data" in STEP7 manual "Designing user programs".
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