Siemens SIMATIC S7-300 FM 350-1 - Page 91

Operating Modes, parameters and commands
7.3 Count modes
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
91
Selecting the Gate Function
You can select the gate control in this mode. The following possibilities are available to you:
● Without gate (default)
● SW gate
● Hardware gate, level-controlled or edge-controlled
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8SSHUFRXQWOLPLW
/RZHUFRXQWOLPLW
&XUUHQWFRXQWHUOLPLW
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*DWHVWRS 7LPH
Figure 7-1 Continuous counting with gate control
Opening and Closing the Software Gate
You open and close the software gate of the counter in each case with the input parameter
SW_GATE of the FC CNT_CTL1.
Table 7- 6 Triggering the Opening/Closing of a SW Gate (Continuous Counting)
Action ...Is initiated by
Open software gate Setting SW_GATE
Close software gate Resetting SW_GATE
When the software gate opens, the counting operation resumes with the current counter
level.
Opening and Closing the Hardware Gate
You open and close the hardware gate by applying the relevant signals to or removing the
signals from the digital inputs DI Start and DI Stop.
Table 7- 7 Triggering the Opening/Closing of a HW Gate (Continuous Counting)
Action ...Is initiated by
Open hardware gate (level-controlled) Apply signal to digital input DI Start
Close hardware gate (level-controlled) Remove signal from digital input DI Start
Open hardware gate (edge-controlled) Apply positive pulse edge across digital input DI
Start
Close hardware gate (edge-controlled) Apply positive pulse edge across digital input DI
Stop
When the hardware gate opens, the counting operation resumes with the current counter
level.