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Operating Modes, Settings, Parameters and Commands
9.9
Command: Open and Close Gate
Introduction
Selecting the Gate
Level-Controlled
Opening and
Closing of the
Hardware Gate
9
9-16
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The counters of the FM 450-1 have the following gates:
A hardware gate that you can open either with level control or with edge
control.
A software gate that you can open and close via control bits in the user
program.
When you select the operating mode (see Section 9.1), you define which
gate you want to use for the count.
The figures below represent the different methods of opening and closing the
gates of the FM 450-1.
Figure 9-4 shows level-controlled opening and closing of the hardware gate
of counter 1.
Count pulses
Input 1I0
Figure 9-4
Level-Controlled Opening and Closing of the Hardware Gate of Counter 1
As long as input 1I0 is set, the count signals can reach counter 1 and be
counted. If you remove input 1I0, the gate is closed. The count pulses are no
longer counted and counter 1 remains stopped.
If the gate of counter 1 is closed by an overflow or underflow, you must first
reset input 1I0 and apply a positive edge to input 1I0 in order to open the
gate again.
Counter status
1
2
3
4
Open gate
Close gate
FM 450-1 Counter Function Module
C79000-G7076-C450-01
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