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11.9 I&M data
Overview Identification and maintenance data (I&M) is information stored in the module;
it helps you in the following cases:
Checking the system configuration
Finding hardware changes in a system
Eliminating errors in a system
I&M data allows you to clearly identify modules.
NOTE
Only one master may access the I&M data of a bus node at a time.
Identification data Identification data (I data) is information about the module, such as order num-
ber or serial number. Partly, this information is printed on the housing of the
module. I data is the information a manufacturer provides for the module. It
can only be read.
Maintenance data Maintenance data (M data) is system-specific information, such as installation
site and date. M data is created during planning, written to the module, and
saved there remanently.
Structure of the data re-
cords
Using Read data record you can access certain identification data specifical-
ly. In this case you address parts of identification data using the corresponding
index. The data records have the structure shown in the following table.
Header information
Tab. 11-10: I&M data, header information
Identification data 0: IN-
DEX: 0xAFF0
Representation: R = read access
Contents Length (Byte) Coding (hex)
- BlockType 2 I&M0: 0x0020
I&M1: 0x0021
I&M2: 0x0022
I&M3: 0x0023
- BlockLength 2 I&M0: 0x0038
I&M1: 0x0038
I&M2: 0x0012
I&M3: 0x0038
- BlockVersionHigh 1 0x01
- BlockVersionLow 1 0x00
Identification data
(see the following table)
I&M0 / Index 0xAFF0: 0x54
I&M1 / Index 0xAFF1: 0x54
I&M2 / Index 0xAFF2: 0x16
I&M3 / Index 0xAFF3: 0x54
I&M data Access Presetting Description
VendorIDHigh R (1 bytes) 0x02 Name of the manufacturer
555 = Murrelektronik GmbH
VendorIDLow R (1 bytes) 0x2B
Order_ID R (20 bytes) Order number
IM_SERIAL_NUMBER R (16 bytes) - Serial number
IM_HARDWARE_REVISION R (2 bytes) 1 Hardware revision
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