Operating Modes, parameters and commands
7.3 Count modes
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
101
Opening and Closing the Software Gate
You open and close the software gate and set the counter to the load value with the
SW_GATE input parameter of FC CNT_CTL1.
Table 7- 11 Opening/Closing the Software Gate
Action ...Is initiated by
Open software gate Setting SW_GATE
Close software gate Resetting SW_GATE
Opening and Closing the Hardware Gate
You open and close the hardware gate and set the counter to the load value by applying and
removing the corresponding signals to and from digital inputs DI Start and DI Stop.
Table 7- 12 Triggering the Opening/Closing of a HW Gate (Periodic Counting)
Action ...Is initiated by
Open hardware gate (level-controlled) Apply signal to digital input DI Start
Open hardware gate (edge-controlled) Apply positive pulse edge across digital input DI Start
Close hardware gate (level-controlled) Remove signal from digital input DI Start
Close hardware gate (edge-controlled) Apply positive pulse edge across digital input DI Stop
If a positive pulse edge is reapplied across the digital input DI Start in the case of an edge-
controlled hardware gate, the counter will again start counting from the load value,
irrespective of whether the gate is closed or still open (retrigger); that is, provided that the
digital input DI Stop is not set.
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