Command: Open And Close Gate - Siemens FM 450-1 Equipment Manual

Modes, settings, parameters and commands

8.10 Command: Open and close gate

Pulse duration begins when the output is set. Inaccuracy of the pulse duration is less than 1°ms.
Value range
You can prescribe a value between 0 and 500°ms for the pulse duration. This value applies to
both outputs together.
Note
If you specify the pulse duration to be zero you must ensure that the count pulse times are
greater than the minimum operation time of the digital outputs (operating time:°300°µs, i°e. the
count frequency is less than 3333°Hz); otherwise the control pulses are lost at the outputs.
In this case check if your actor can respond with the operating time 300°µs.
Default value
The default value for the pulse duration is 0.
8.10 Command: Open and close gate
Overview
The FM 450-1 counters have the following gates:
• A hardware gate (HW gate) which you can open and close level controlled or edge controlled.
• A software gate (SW gate) which you can open and close via control bits in the user program.
Selecting a gate
In the "Operating Mode" dialog (see section "Overview of modes, settings and commands
(Page 57)"), you specify which gate you want to use for the count process.
The following figures demonstrate the various possibilities for opening and closing the FM
°450-1 gates.
Level controlled opening and closing of the HW gate
The following figure shows the level controlled opening and closing of the HW gate of counter
°1.
68
Counter module FM 450-1
Equipment Manual, 03/2022, A5E03648739-AC