Siemens SIMATIC S7-1500 Manual page 60

Parameter
Time base for velocity
measurement
1
Increments per unit
1
Because the number of parameters is limited to a maximum of 244 bytes per station in the PROFIBUS GSD configura-
1
tion, the possible parameter assignments are limited. The parameters are preassigned default settings in the module. If
your PROFIBUS master supports the "Write/read data record" function, you can set these parameters using data rec-
ord 128.
When a GSD file is used, this diagnostic interrupt is enabled with the "Enable additional diagnostic interrupts" parameter
2
and is then not separately configurable.
When configuring with a GSD file, you determine the operating mode when you select the module name.
3
NOTICE
Too high an encoder speed can supply the wrong rotation direction
If an SSI absolute encoder rotates so fast that more than half the value range is covered
within one module cycle
correctly. As a result, the following may function incorrectly:
• DQ functions
• Feedback bits EVENT_OFLW, EVENT_UFLW, EVENT_ZERO, EVENT_CMP0,
Non-isochronous mode: 500 μs; isochronous mode: PROFINET cycle time
1
Note
If you use an SSI absolute encoder whose value range does not correspond to a power of 2,
the calculated velocity measurement can be incorrect at the moment of the overflow.
Explanation of parameters
You can find a detailed description of the parameters in function manual Counting,
Measurement and Position Detection, sections Basic parameters and Manual operation
available for download on the Internet
(http://support.automation.siemens.com/WW/view/en/59709820).
Technology module TM PosInput 2 (6ES7551-1AB00-0AB0)
Manual, 06/2018, A5E03982218-AB
Value range
1 ms
•
10 ms
•
100 ms
•
1 s
•
60 s
•
1...65535
, the velocity and rotation direction are no longer calculated
1
EVENT_CMP1 and STS_DIR
4.3 Manual operation (without technology object)
Default setting Parameter
reassign-
ment in
60 s Yes
1 Yes
Configuring/address space
Scope
HSP for STEP 7
(TIA Portal);
RUN
GSD file
Channel
Channel
59