Operating Modes, parameters and commands
7.3 Count modes
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
Figure 7-10
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.
104
Level-triggered opening and closing of the HW gate
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01