Description
2.1 Block specification
FC 45
Function manual, Release 03/2006 , J31069-D0167-U001-A2-7618
2-3
2.1
2.1
Block specification
Block number:
FC 45
Block name:
FC 45
Symbolic name:
"MOBY FC"
Family:
–
Work memory requirement:
7260 bytes
Local data:
132 bytes
Version:
2.6
Called blocks:
SFC 58, SFC 59, SFC 20, SFC 21, SFC 1
Data block resources:
MOBY Param = 300 bytes per channel
(defined via UDT 10)
Bit memories used:
none
Counters used:
none
Registers used:
AR1, AR2
Call:
cyclic
Table 2-1
Typical runtimes of FC 45 (cycle load of AS in ms)
ASM Centrally in S7-300
Distributed ASM on
PROFIBUS
S7-CPU
Idle pass
Read MDS
Write MDS
Read MDS
Write MDS
315-2 DP
1.9
3.7 + n * 0.023
3.6 + n * 0.022
3.4
3.6
318-2 DP
0.13
1 + n * 0.01
1.3 + n * 0.007
0.4
0.45
416-2 DP
0.1
–
–
0.35
0.38
315-2 PN/DP
317-2 PN/DP
318-2 PN/DP
n = Amount in bytes of processed user data per read or write command
When a command processes more than 233 bytes of MDS data, n = 233 must always be
used in the table.
Remarks:
The times of the ASM for data communication with the data memories are described in the
MOBY manual for configuration, mounting and service.