Communication using function blocks
6.8 Technical data of the function blocks
PtP coupling and configuration of CP 340
126 Manual, 04/2011, A5E00369892-03
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 CP340
● FB2 V2.0 (P_RCV)
● FB3 V2.0 (P_SEND)
● FB4 V2.0 (P_PRINT)
and
● FB12 V1.0 (P_RESET)
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 FB2, FB3 and FB4 with the designations FB102
(P_RCV_OLD2), FB103 (P_SEND_OLD) and FB104 (P_PRINT_OLD) in their regular
location.
(*) All S7-300 CPUs with MMC and S7-400 CPUs as of firmware version 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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