Siemens SIMATIC ET 200SP - Page 122

Using the High_Speed_Counter technology object
3.6 Programming the High_Speed_Counter
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG
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3. Set the relevant Set tag for execution of the change command.
4. Use the output parameter Error to check whether an error has occurred.
If no errors have occurred and the Set tag has been automatically reset by the technology
object, the parameter change was successful.
Note
Changed counting limit
If the new high counting limit is less than the current counter value, the counter value is set
to the low counting limit or the start value according on the parameter assignment. If the new
low counting limit is greater than the current counter value, the
counter value is set to the
high counting limit or the start value according to the parameter assignment.
Operating mode (High_Speed_Counter V3.0 or higher)
Configure the operating mode in the technology object under "Behavior of DQ0".
The operating mode is indicated by the output parameter CompareMeasuredValue:
State
Description
FALSE Operating mode "Use count value as reference"
The comparison functions work with the counter value. The following static
variables are specifically used in this operating mode:
• NewReferenceValue0
• NewReferenceValue1
• CurReferenceValue0
• CurReferenceValue1
The four specific static variables of operating mode "Use measured value as
reference" are ignored.
TRUE Operating mode "Use measured value as reference":
The comparison functions work with the measured value. The following static
variables are specifically used in this operating mode:
• NewReferenceValue0_M
• NewReferenceValue1_M
• CurReferenceValue0_M
• CurReferenceValue1_M
The four specific static variables of operating mode "Use count value as ref-
erence" are ignored.