Pepperl+Fuchs ENA TL IO Series, Manual, Page: 18 / 44

2
0
2
0
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ENA**TL-**IO**
Process Data Structure
Figure 5.2 Different shaft position for multiturn versions depending on singleturn resolutions
The example also shows that the current shaft position (= MDC1 - Position) and the set sin-
gleturn resolution (= Config - ST Resolution = MDC1 - ST Resolution) can be used to determine
the corresponding multiturn position (= number of full revolutions completed). If a complete rev-
olution means 1000 steps, a measured value equating to MDC1 - Position = 1875 means that
one full revolution and a further 875 steps of the next revolution have been completed.
Refer to information on the "MDC1 - ST Resolution" process data content and the "Config -
Position Overflow" parameter.
5.2 MDC1 - Position
Measurement Data Channel 1 - Position
The "MDC1 - Position" process data content returns the current absolute shaft position. If the
shaft is rotated when the device is disconnected from the power supply, the new shaft position
is updated and immediately available once the device is switched on again.
The number of measuring steps that are counted in one revolution can be set as required.
Refer to information on the "Config - ST Resolution" and "Position Value - Overflow" parame-
ters.
5.3 MDC1 - ST Resolution
Measurement Data Channel 1 - Singleturn Resolution
The "MDC1 - ST Resolution" process data content describes the singleturn resolution and cor-
responds to the value set as the "Config - ST Resolution" parameter.
This value determines how many measuring steps are counted in one full revolution.
Refer to information on the "Config - ST Resolution" parameter.
The cyclical transmission of the set singleturn resolution offers significant added value in condi-
tion monitoring applications. The position value from the "MDC1 - Position" process data can
be more easily interpreted.
The "MDC1 - ST Resolution" process data can be used to calculate the current multiturn posi-
tion at any time for all multiturn versions.
The following figure illustrates this with an example for singleturn-only device versions.
1000 0
shaft
1250
1500
1750
shaft
250
500
750
Index Bitoffset Parameter Value
(Process data)
- 32 MDC1-Position 875
0x60 - Config-ST Resolution 1000
Index Bitoffset Parameter Value
(Process data)
- 32 MDC1-Position 1875
0x60 - Config-ST Resolution 1000
Shaft position
exceeds zero
position
Position
Multiturn version
second revolution
Position
Multiturn version
first revolution