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Operating Modes, parameters and commands
7.3 Count modes
FM 350-1 Counter module
104
Manual, 05/2011, A5E03648639-01
7.3.7
Command: Open and close gate
Overview
Gates of FM 350-1:
●
A HW gate, level- or edge-triggered.
●
A SW gate which you can open and close by setting control bits in the user program.
Selecting a gate
You define which gate you are going to use for the count in the mode interface.
The diagrams below illustrate the various options of opening and closing the gates of
FM 350-1.
Level-triggered opening and closing of the HW gate
',6WDUW
&RXQWSXOVHV
2SHQJDWH
&ORVHJDWH
&RXQWHUVWDWXV
Figure 7-10 Level-triggered opening and closing of the HW gate
The transfer of count pulses to the counter is always enabled as long as digital input DI-Start
is set. A reset at digital input DI-Start closes the gate. The counter stops and ignores any
further count pulses.
If the gate was closed as a result of overflow or underflow, you open it again by a reset > set
cycle at digital input DI-Start.
The level-triggered HW gate is activated by the first positive edge at input DI-Start after you
set the parameters.
Whole you programming those parameters, the module does not evaluate input DI-Stop, but
indicates its status at bit STS_STP.
Содержание SIMATIC S7-300 FM 350-1
Страница 8: ...Table of contents FM 350 1 Counter module 8 Manual 05 2011 A5E03648639 01 ...
Страница 168: ...Encoder signals and their evaluation 8 4 Signal evaluation FM 350 1 Counter module 168 Manual 05 2011 A5E03648639 01 ...
Страница 186: ...Technical data 11 2 Technical data FM 350 1 Counter module 186 Manual 05 2011 A5E03648639 01 ...
Страница 188: ...Replacement parts FM 350 1 Counter module 188 Manual 05 2011 A5E03648639 01 ...
Страница 190: ...References FM 350 1 Counter module 190 Manual 05 2011 A5E03648639 01 ...
Страница 194: ...Glossary FM 350 1 Counter module 194 Manual 05 2011 A5E03648639 01 ...