Siemens MOBY FC 56, Technical Description

Page: 13 / 154

2-1
FC 56
J31069-D0155-U001-A0-7618
Block Specifications
2.1 Technical Data
Block number: FC 56
Block name: FC 56
Symbolic name: “MOBY FH-MT”
Family: –
Work memory requirements: 8932 bytes
Local data: 146 bytes
Version: 1.0
Blocks called: SFC 58, SFC 59, SFC 20, SFC 21, SFC 1
Assignment of data blocks: MOBY Param = 300 bytes per channel
(defined with UDT 10)
Flags used: None
Counters used: None
Registers used: AR1, AR2
Call: Cyclic
Table 2-1 Typical runtimes of FC 56 (cycle load of AS in msec)
S7-CPU Idle Pass ASM Centrally in S7-300 ASM Distributed on
PROFIBUS
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
n = Amount in bytes of processed
user data
per read or write command
When a command processes more than 214 bytes of MDS data, n = 214 must
always be used in the table.
Remarks:
The times of the ASM for data communications with the
data memories are described in the MOBY configuration manual.
2