Operating Modes, parameters and commands
7.3 Count modes
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
133
7.3.13
Command: Measure edge intervals
Introduction
You can use this command to measure the time between two immediately successive edges
at the Start DI digital input.
Prerequisites
The following prerequisites must be fulfilled in order to use this command:
●
There must be no encoders connected to the FM 350-1.
●
Set the operating mode to any count mode.
●
For Gate Control, set: Latch/Retrigger.
●
For Encoder, set: Internal time Base 1 MHz
Selecting the Edges
Table 7- 28 Selecting the Edges for the Time Measuring
To measure the time between two immediately
successive ...
... Parameterize
Rising edges at DI Start
Latch with positive edge
Falling edges at DI Start
Latch with negative edge
Any edges at DI Start
Latch with both edges
Mode of operation
The FM 350-1 uses an internal time base of 1 MHz in order to measure times. The time
measurement starts with the first edge at DI Start. With every further edge at DI Start, the
time in µs that has elapsed since the last edge is always saved as the latch value
LATCH_LOAD in the feedback interface.
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 ...