Siemens SIMATIC ET 200AL - Counting Limit Behavior Continuation; Continue Counting Example (Backward Direction)

Commissioning
8.3 Identification and maintenance data
Distributed I/O system
74 System Manual, 02/2018, A5E31861578-AF
8.3
Identification and maintenance data
8.3.1
Reading out and entering I&M data
Introduction
Identification data I&M is information that is saved either as read-only (I data) or read/write
(M data) on the interface module.
Identification data (I&M0):
Manufacturer information on the module that is read-only and in
some cases is also printed on the module housing, for example, article number, serial
number and firmware version.
Maintenance data (I&M1, 2, 3):
Plant-dependent information, e.g. installation location.
Maintenance data is created during configuration and written to the module.
All modules of the ET 200AL distributed I/O system support identification data (I&M0 to
I&M3).
The I&M identification data supports you in the following activities:
● Checking the plant configuration
● Locating hardware changes in a system
● Correcting errors in a system
With the I&M identification data, you have the option of clearly identifying modules online.
In STEP 7, the identification data is displayed in the "Module status - IM 157" and
"Properties..." tabs (see STEP 7 online help).
Options for reading out I&M data
You have the following options for reading the I&M data:
● Via the user program
● Via STEP 7 or HMI devices
Procedure for reading I&M data by means of the user program
To read the I&M data of the interface module in the user program, use the instruction
"RDREC".
Procedure for reading the I&M data using STEP 7
Requirement: There must be an online connection to the interface module.
1. In the project navigation, under "Distributed I/O", select the I/O device or the DP slave,
e.g. "IM 157-1 PN".
2. Select:
IO device/DP slave > Online & Diagnostics > Identification & Maintenance
.