Technical data
6.3 Message frames
TM15 / TM17 High Feature Operating Manual
82 Commissioning Manual, 05/2009
6.3 Message frames
The maximum length of either the setpoint message frame or the actual value message
frame is
● With integrated drives (SIMOTION D/CX32): 512 bytes
● With external drives (CU320/CU310):
– On PROFIBUS DP: 244 bytes
– On PROFINET IO: 1,380 bytes
Please be aware, however, that this maximum length applies to the entire PROFIBUS slave
or the entire PROFINET device and therefore contains all data for the SINAMICS drive unit,
including:
● Message frame length for all modules of type TM15/TM17 High Feature
● Message frame length for all axes
● Message frame length for all Line Modules
If the message frame contains too much data, the number of allowable TMs may be
reduced.
The message frame length of a TM1x module can be calculated using the following
formulas:
N = number of time-driven output channels (i.e. outputs of output cam).
M = number of time-driven input channels (i.e. inputs of measuring input or edge-triggered
enable inputs).
● TM15: (N + M ≤ 24)
Length of setpoint message frame (output address area)
= 12 + 2 · N (max. = 60 bytes)
Length of actual value message frame (input address area)
= 12 + 2 · M (max. = 60 bytes)
● TM17 High Feature: (N + M ≤ 16)
Length of setpoint message frame (output address area)
= 8 + 4 · N (max. = 72 bytes)
Length of actual value message frame (input address area)
= 8 + 4 · M (max. = 72 bytes)
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