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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

Priority Description

Command1 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.

Command2 Medium priority

Command3 Lowest priority Cyclic commands from the "Command3" command mail‐

box are interrupted to run a command in the "Command2"

or "Command1" command mailbox.

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".

Parameter assignment/addressing

6.2 TIA Portal user program

Technology module TM SIWAREX WP351 HF

44 Operating Instructions, 01/2020, A5E47521010-AA

Siemens SIMATIC ET 200SP Operating Instructions

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