Technical information

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Functions (continued)
Modicon M340 automation
platform
0
BMX EHC 0200/0800 counter modules
Operating modes for module BMX EHC 0800
5 configurable 16-bit
modes
Frequency meter This mode measures a frequency, speed, rate or data stream control.
As standard, this mode measures the frequency received on the IN A input.
This frequency is always expressed in Hz (number of pulses per second), with a precision of
1 Hz.
The maximum frequency on the IN A input is 10 kHz.
The maximum cyclic ratio at 10 kHz is 60%.
Event counting This mode is used to determine the number of events received.
In this mode, the counter calculates the number of pulses applied to the IN_A input at time
intervals defined by the user.
As an option, it is possible to use the IN_AUX input during a period of time, provided that the
enable bit has been configured.
The module counts the pulses applied to the IN_A input each time the pulse for this input lasts
longer than 50 µs (without anti-bounce filter).
Pulses with less than 100 ms synchronization are lost.
Downcounting This mode is used to list a group of operations. In this mode, when counting is enabled
(software validation via the valid_sync command), a rising or falling edge on the IN_AUX input
causes a value, defined by the user, to be loaded in the counter. The latter decreases with each
pulse applied to the IN_A input until it reaches the value 0. Downcounting is made possible
when the force_enable command is high (software positioning).
The smallest pulse applied to the IN_AUX input varies according to the selected filter level.
The maximum frequency applied to the IN_AUX input is 1 pulse every 25 ms.
Loop (modulo) counting This mode is used in packaging and labelling applications where actions are repeated on sets
of moving objects.
The counter increases with each pulse applied to the IN_A input until it reaches the user-
defined “modulo - 1” value. On the next pulse in the upcounting direction, the counter is reset to
0 and upcounting restarts.
The maximum frequency applied to the IN_A input is 10 kHz.
The smallest pulse applied to the IN_AUX input varies according to the selected filter level.
The maximum frequency of the modulo event is 1 event every 25 ms.
The maximum modulo value is 65,536 units.
Up/down counter This mode is used for an accumulation, upcounting or downcounting operation on a single
input.
Each pulse applied to the IN_A input produces:
Upcounting of pulses if the IN_AUX input is high
Downcounting of pulses if the IN_AUX input is low
The counter values vary between the limits - 65,536 and + 65,535.
The maximum frequency applied to the IN_A input is 10 kHz.
Pulses applied to the IN_A input after a change of direction are only upcounted or downcounted
after a period corresponding to the delay for taking account of the state of the IN_AUX input due
to the programmable filter level on this input.
b
b
One 32-bit mode 32-bit counter counting
32-bit counter counting mode is available for channels 0, 2, 4 and 6 (channels 1, 3, 5 and 7 are
now inactive). It behaves in the same way as the up/down counting mode using up to 3 physical
inputs. It enables simultaneous upcounting and downcounting.
The counter values vary between the limits - 2,147,483,648 and + 2,147,483,647 (31 bits +
sign).
The maximum frequency applied to the IN_A and IN_B inputs is 10 kHz.
The smallest pulse applied to the IN_AUX input is defined according to the filtering applied to
this input.
The maximum frequency of loading the preset value is 1 every 25 ms.
Processors:
page 1/2
Communication:
page 3/2
Software:
page 4/2
Ruggedized Modicon M340 modules:
page 6/2