Once-Only Counting - Siemens SIMATIC ET 200S Operating Instructions Manual

1Count24V/100kHz
2.6 Count Modes
Influencing the Behavior of the Digital Outputs via:
• Hysteresis
• Pulse duration
Changing Values during Operation
The following values can be changed during operation:
• Load value (LOAD_PREPARE)
• Count (LOAD_VAL)
• Comparison value 1 (CMP_VAL1)
• Comparison value 2 (CMP_VAL2)
• Function and behavior of the digital outputs (C_DOPARAM)
See also
Latch Function (Page 33)
Synchronization (Page 36)
Behavior Types of the Outputs in Count Modes (Page 37)
Assignment of the Feedback and Control Interface for the Count Modes (Page 46)
2.6.3

Once-Only Counting

Definition
In this mode, the 1Count24V/100kHz counts once only, depending on the assigned main
count direction ("Main Count Direction" parameter).
• When there is no main count direction:
• When the main count direction is up:
24
– Counts starting from the load value.
– Counts up or down.
– The counting limits are fixed at the maximum count range.
– If the high or low counting limit is violated, the gate is closed automatically, and the
counter jumps to the respective counting limit.
– Counts starting from the load value.
– Counts up or down.
– When the high counting limit is reached, the counter jumps to the load value and the
gate is closed.
– The high counting limit can be assigned, and the load value has RESET state = 0 and
can be changed.
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05