REXROTH efc series - Acyclic Communication

5.3 Acyclic Communication
5.3.1 Principle
Acyclic communication is mainly used for parameter read/write accesses from
controller, supervisor etc. The PROFINET service “read/write record” (RPC over
UDP) is utilized to realize the object addressing.
With the SFB52 “RDREC” and SFB53 “WRREC”, a data record with the number
INDEX can be read from or written to a PROFINET IO device module defined by
ID. The key arguments ID and INDEX are described below.
When parameter write access on the two bytes type parameter, any
values exceed 65,535 (0xFFFF) will be reduced automatically to a
two bytes value. If the reduced two bytes value is in the valid range,
then it will be accepted and without value exceed limits indication.
5.3.2 Module ID
The diagnostic address of the PROFINET IO device can be treated as the module
ID when read/write record is called. It can be found in the hardware configura-
tion of the software tool.
Fig. 5-5: Diagnostic address
5.3.3 Record Index
The record index corresponds exactly to the function code parameter to be ac-
cessed. The address of the function code parameter is composed of a higher
byte representing the parameter group and a lower byte representing the sub-in-
dex in the group.
The parameter group map is shown as below.
Group
Index Value Example
b 0…9 0x00...0x09 b0: 0x00
d 0…9 0x10...0x19 d0: 0x10
C 0…9 0x20...0x29 C3: 0x23
E 0…9 0x30...0x39 E8: 0x38
U 0…9 0x40...0x49 U1: 0x41
Bosch Rexroth AG
PROFINET IO
Multi-Ethernet Card
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DOK-RCON0*-XFCX610*MUL-IT02-EN-P