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Description
Performance features of FC 45
• All MOBY systems (write/read devices and MDSs) can be used with the FC 45.
• The user can process a complete MDS with one command (up to 32KB).
• The user can chain several commands together. This means that many small data areas
• The data structures are set up conveniently via user-defined data types (UDTs). The
• Transmission of the data to and from the ASM and execution of the commands on the
• The use of symbolic names enhances the clarity in the user program, even where
PROFIBUS configuration
A GSD file on the "Software MOBY" product (6GT2 080-2AA10) is included for the interface
modules which can be connected directly to PROFIBUS.
Technically, the FC 45 uses the PROFIBUS DP-V1 protocol. Important control data are
cyclically sent in a data word. Actual MOBY data are transmitted in non-cyclic telegrams.
Non-SIMATIC applications
Applications programmed on third-party PLCs cannot use FC 45. The PROFIBUS interface
for such applications is described in Section "Programming the MOBY-ASM on PROFIBUS
DP-V1". Programmers of a remote controller can use this interface to develop their own
MOBY function. The same or similar data structures as in FC 45 can be reproduced on a
third-party PLC in conjunction with the FC 45 description and the UDTs.
Requirements for using FC 45
The FC 45 can access the communication module (ASM) via any PROFIBUS master that
has the system functions SFC 58/59. It is immaterial whether the PROFIBUS master is
integrated into the S7-CPU or plugged into the rack as an add-on module (e.g. IM 467).
Remember that the FC 45 uses non-cyclic message frames (SFC 58/59). Older CPUs of the
SIMATIC family or a small model series may not have these services. Be sure to check this
during configuration.
• STEP7 Version
2-2
of an MDS can be processed with one command start.
UDTs are available with English (UDT 10, 20), German (UDT 11, 21) and Spanish (UDT
24) commentary. In this description, the UDTs are always referred to by their English
designation (UDT 10, 20).
ASM take place in parallel. This means optimal data throughput.
complex configurations are involved.
The ASM 475 and ASM 473 modules require a STEP7 Version ≥ V5.1.
Function manual, Release 03/2006 , J31069-D0167-U001-A2-7618
FC 45
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