Siemens SIMATIC ET 200pro - D.3.9 Data record 94 - read measured values

Appendix
A.2 STEP 7 program examples
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB
235
Explanation of FC 1
Table A- 3 Request to read parameters
Data block DB 1
Byte n
Bytes n + 1
n
Header
Reference MB 40
01 hex: Read request
0
01 hex
Number
of parameters (m)
MB 62 2
Address, parame-
ter 1
Attribute 10 hex: Parameter value
Number of indexes MB 58
4
Parameter number MW 50
6
Number of the 1st index MW 63
8
Address, parame-
ter 2
Attribute 10 hex: Parameter value
Number of indexes MB 59
10
Parameter number MW 52
12
Number of the 1st index MW 65
14
Address, parame-
ter 3
Attribute 10 hex: Parameter value
Number of indexes MB 60
16
Parameter number MW 54
18
Number of the 1st index MW 67
20
Address, parame-
ter 4
Attribute 10 hex: Parameter value
Number of indexes MB 61
22
Parameter number MW 56
24
Number of the 1st index MW 69
26
SFC 58 copies the specifications for the parameters to be read from DB 1 and sends them to
the inverter as a read request. No other read requests are permitted while this one is being
processed.
After the read request and a waiting time of one second, the controller takes the parameter
values from the inverter via SFC 59 and saves them in DB 2.