Siemens Sinamics S120 Function Manual page 570

Communication
10.1 Communication according to PROFIdrive
MTn_ZS_F and MTn_ZS_S
Display of the measuring time determined
The measuring time is specified as a 16-bit value with a resolution of 0.25 μs.
MT_DIAG
The maximum measuring frequency of a probe is up to 8 rising and 8 falling edges per DP
cycle. Measured values in the measured value buffer are overwritten once this limit has been
exceeded. In MT_DIAG Bit 8..15, the "MTx_MESSPUFFER_VOLL" is set for the specific
probes. Reducing the measuring frequency prevents premature overwriting of the measured
value buffer.
Measured values could be lost if more probe edges occur in the DP cycle than can be
transferred in the telegram. In MT_DIAG bits 0..7, the corresponding bit
"MTx_TELEGRAMM_VOLL" is then set. It indicates a loss of measured values. Reducing the
measuring frequency or selecting a telegram block with higher transfer capacity prevents the
loss of measured values.
Note
Probe diagnostics
The "Measured value buffer full" bit allows you to identify that the measured values in the
telegram no longer represent the first edges in the measuring time period, because all the
measured values in the measured value buffer have already been overwritten by more
recent values.
The probe diagnostics word PZD is a BiCo parameter, which is automatically connected with
the new display parameter r0567 when selecting the telegram block. After activating the
measuring function for several measured values per DP cycle, the diagnostic bits are stored
for the specific probes in r0567 for transfer.
Table 10- 47 Probe diagnostic word r0567
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
568
Name
MT1_TELEGRAMM_VOLL
MT2_TELEGRAMM_VOLL
MT3_TELEGRAMM_VOLL
MT4_TELEGRAMM_VOLL
MT5_TELEGRAMM_VOLL
MT6_TELEGRAMM_VOLL
MT7_TELEGRAMM_VOLL
MT8_TELEGRAMM_VOLL
MT1_MESSPUFFER_VOLL
MT2_ MESSPUFFER_VOLL
MT3_ MESSPUFFER_VOLL
MT4_ MESSPUFFER_VOLL
MT5_ MESSPUFFER_VOLL
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions