Parameter Data Record; Parameter Assignment And Structure Of The Parameter Data Record - Siemens SIMATIC ET 200SP Manual

Parameter data record

A.1

Parameter assignment and structure of the parameter data record

You have the option of reassigning module parameters with the user program while the CPU
is in RUN. The parameters are transferred to the module using data record 128, for example
with the WRREC instruction.
If errors occur during the transfer or validation of parameters with the WRREC instruction,
the module continues operation with the previous parameter assignment. A corresponding
error code is then written to the STATUS output parameter. If no errors occur, the STATUS
output parameter contains the length of the actually transferred data.
The description of the WRREC instruction and the error codes is available in section
Parameter validation error (Page 81) or in the online help of STEP 7 (TIA Portal).
Structure of data record 128
The table below shows you the structure of data record 128 for TM Count 1x24V with
1 channel. The values in byte 0 to byte 3 are fixed and may not be changed. The value in
byte 4 can only be changed by means of new parameter assignment and not in RUN mode.
Note
After each writing of data record 128, the module is set to its startup state and the counter
value is set to the start value. If Reaction to CPU STOP "Continue operation" is set, the
module is only set to its startup state when data record 128 has been changed.
Table A- 1 Parameter data record 128
Bit →
Bit 7
Byte ↓
0...3
0
1
2
3
73
Bit 6 Bit 5
Major Version = 0
Length of the parameter data = 48
Bit 4 Bit 3
Header
Reserved
2)
Reserved
2)
Technology Module TM Count 1x24V (6ES7138-6AA00-0BA0)
Bit 2 Bit 1
Minor Version = 1
Manual, 02/2017, A5E33002339-AB
A
Bit 0