Configuration/programming
2.7 Limitations of use
TM15 / TM17 High Feature Operating Manual
42 Commissioning Manual, 05/2009
2.7.3 Maximum permissible message frame length
Each Terminal Module uses two message frames to communicate with the SIMOTION
Motion Control System:
● Setpoint message frame – contains the programmed setpoints and is sent by the
SIMOTION Motion Control System to the TM.
● Actual value message frame – contains the current state of the I/O and is sent by the TM
to the SIMOTION Motion Control System.
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
However, because the message frames are user-configured, the length of the message
frames is determined by the current configuration (i.e. the actual length can be less than 244
bytes, 512 bytes, or 1,380 bytes).
Message frames contain all data for the drive unit, including:
● Message frame length for all modules of type TM15/TM17 High Feature
● Message frame length for all axis message frames (e.g.: Standard message frame 5 has
"PZD 9/9" → 9 words [18 bytes] in each direction)
● Message frame length for all Line Modules (e.g.: SIEMENS telegram 370 for infeed with
PZD 1/1 → 1 word [2 bytes] in each direction)
● ........
If the message frame contains too much data, the number of TMs must be reduced.
See also
Message frames (Page 82)
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