TR-Electronic LMC-55 Benutzerhandbuch Seite 125

6.3.4 Acyclic parameter access (Base Mode Parameter Access - Local)
The measuring system parameters in the parameter number range 9xx, 600xx (PROFIdrive specific
parameters) and 650xx (Encoder Profile specific parameters) are written or read via the acyclic Data
Exchange Service using the standardized data exchange format "Base Mode Parameter Access -
Local". Implementation was in accordance with the PROFIdrive drive profile.
The parameters are accessed using the client-server principle via the record data object with index
0xB02E.
In the record data request the IO controller specifies which parameter is to be read or written, and in
the record data response the IO device transmits the read data, or confirms the write command.
The record data request is triggered via a write command by means of the system function block SFB
53 "WRREC" (write record) provided by SIEMENS. The record data response must be requested
separately via a read command by means of the system function block SFB 52 "RDREC" (read
record).
The exact mode of operation of the system function blocks can be taken e.g. from the SIEMENS
description"6ES7810-4CA08-8AW1, System Software for S7-300/400 System and Standard Functions
for Volume 1/2".
Declaration of input parameters SFB52 / SFB53:
IN parameter
REQ
ID
INDEX
MLEN
RECORD (IN/OUT)
Only one command can be processed at a time.
The initiative always comes from the IO controller.
Only one parameter can be processed in a command.
Printed in the Federal Republic of Germany
08/06/2019
Type Description
BOOL REQ = 1: Perform data record transmission
Logical address of DP slave/PROFINET IO component (unit or
DWORD
module diagnostic address according to configuration)
INT 0xB02E, valid for all 9xx and 6xxxx parameters
Maximum length of the data record information to be read in
INT bytes or maximum length of the data record to be transmitted in
bytes for a write command.
The actual record data request or record data response must be
ANY specified here, see following tables Table 1: Record Data
Request and Table 2: Record Data Response
TR - ELA - BA - DGB - 0030 - 02
 TR-Electronic GmbH 2018, All Rights Reserved
Page 125 of 167