Executing Commands - Siemens SIMATIC ET 200SP Operating Instructions Manual

Parameter assignment/addressing
6.2 TIA Portal user program
6.2.3

Executing commands

Introduction
Data records (DR) are read or written via specific command codes. There are three command
mailboxes within the interface DB for this purpose.
The command mailboxes are managed and processed according to priority. When all three
command mailboxes are triggered at the same time by the user program, the FB executes them
in the following order:
Command
mailbox
Command1
Command2
Command3
You can find a list of all commands in section: Commands (Page 111).
Requirement
You have called the FB (Page 41).
Procedure
1. Open the interface DB.
2. In one of the command mailboxes "Command1", "Command2" or "Command3", enter a
command code for the parameter "code".
44
Priority Description
Highest priority If you run cyclic commands in the "Command1" command
mailbox, this makes it impossible to run commands in the
"Command2" or "Command3" command mailbox.
Medium priority
Lowest priority Cyclic commands from the "Command3" command mail‐
box are interrupted to run a command in the "Command2"
or "Command1" command mailbox.
Technology module TM SIWAREX WP351 HF
Operating Instructions, 01/2020, A5E47521010-AA