Communication via Function Blocks
6.9 Technical Specifications of the Function Blocks
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 179
System functions used
The following system functions are used in the blocks:
● SFB 52 (RDREC), Read data set
● SFB 53 (WRREC), Write data set
NOTICE
The new standard function blocks of the CP341
• FB7 ≥ V3.0 (P_RCV_RK)
• FB8 ≥ V3.0 (P_SND_RK)
and
• and FB13 ≥ V1.0 (P_PRT341)
operate with the new system function blocks SFB52 (RDREC) or SFB53 (WRREC) that are
supported by the latest CPU versions (*) only. This conversion was necessary because the
old system calls SFC58 (WR_REC) and SFC59 (RD_REC) are not suitable for operation
following an IE/PB link or a PROFINET header.
Users with older CPU versions that do not support SFB52 (RDREC) or SFB53 (WRREC)
yet will find the older versions of FB7 and FB8 with the designations FB107
(P_RCV_RK_OLD) and FB108 (P_SND_RK_OLD) in their regular location. (*) All S7300
CPUs with MMC and S7-400-CPUs as of firmware status V3.0.0 support the new system
function blocks SFB52 and SFB53. CPU318 will permit the use of SFB52/SFB53 with
decentralized periphery only.
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