Siemens MOBY FC 56 Technical Description page 14

Block Specifications
Calculating MOBY data throughput
The formulas in the MOBY configuration manual (chapter 3) can be used to calcu-
late data throughput with the FC 56.
Configuration manuals are currently available MOBY I (6GT2 097-4BA00-0EA2)
and MOBY U (6GT2 597-4BA00-0EA2).
Applicable in general:
t + k ) t
k
Attention
Use the characteristic values for filehandler mode in the formula for data
throughput.
Transmission of the data to the MDS and transmission of the data between ASM
and FC 56 take place in parallel. Usually no further time must be added for data
transmission between ASM and FC 56 so that the time t
represents the total duration of the command.
However, commands may require more time under the following conditions.
S A very large number of MOBY channels are processed in parallel.
S Very few (or only one) system resources are available for non-cyclic telegrams.
S Slow transmission speeds are used on PROFIBUS.
S Other applications are running on the S7 which require the non-cyclic telegram
services (SFC 58/59) of the SIMATIC very frequently.
2-2
t Communication time between ASM, SLG and MDS
k
n Amount of user data
n
Byte
k Constants (see table in configuration manual)
t Transmission time for 1 byte
Byte
(see table in configuration manual)
calculated above
k
FC 56
J31069-D0155-U001-A0-7618