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FEMA ELECTRÓNICA . SERIES B . Models Bxx-C1
1.13.3 Counter modes description
The instrument offers 5 selectable impulse counter modes.
Each mode has 2 independent input channels 'A' and 'B'. Each
impulse counter mode has a specific function assigned to
channel 'B'.
• Standard counter ('cn.1') (see section 1.13.4) counts im-
pulses received at channel 'A'. This counter has an optional
'FAST' mode to count high frequencies up to 250 KHz. The
'FAST' mode detects impulses on the rising edge of the im-
pulse. The first edge received (rising or falling) after the in-
strument start up (after power loss or configuration change)
will not be counted as a valid impulse, as it is needed for
internal initialization.
• Quadrature counter ('cnq.2') (see section 1.13.5) counts
quadrature impulses received at channels 'A' and 'B', (for ex-
ample from a bidirectional encoder). The counter increases
or decreases depending on the sense of turn of the encoder.
• Counter with inhibit ('cnI.3') (see section 1.13.6) counts im-
pulses received at channel 'A' if channel 'B' is inactive. Acti-
vate channel 'B' to inhibit the counting of impulses received
1.13.4 Standard counter 'cn.1' configuration menu
Multiplier
Counter
configuration
Divider
Preset
Mode
'FAST' mode
1.13.5 Quadrature counter 'cnq.2' configuration menu
Multiplier
Quadrature
counter conf.
Divider
Preset
Quadrature
edges
12
at channel 'A'.
• Counter with add / subtract control ('cnc.4') (see section
1.13.7) increases the counter with impulses received at
channel 'A' if channel 'B' is active. Deactivate channel 'B' to
decrease the counter with impulses received at channel 'A'.
• Differential counter ('cnd.5') (see section 1.13.8) increases
the counter with impulses receive at channel 'A' and de-
creases the counter with impulses received at channel 'B'.
All counter modes have scalable reading through multiplier
(1 to 999999) and divider (1 to 999999) parameters, configu-
rable preset value (preset value loads on display when 'reset'
function activates), configurable reset function and accessible
from external terminal, front keypad or at alarm activation.
Alarms with independent activation and deactivation delays
and functions to load 'preset' or '0' to generate cycles of
counting from 'preset' to 'alarm setpoint' and back. The num-
ber of cycles is accessible.
In case of power loss, the instrument recovers the last configu-
ration and last counted value.
Configuration menu for mode 'counter' ('cn.1'). Total im-
Multiplier
pulses received are multiplied by the value of the 'multiplier'
1 to 999999
('MuLt') parameter and divided by the 'divider' ('dIV') pa-
Divider
rameter. Result is shown on the display.
1 to 999999
• set the 'Multiplier' ('MuLt') parameter from 1 to 999999.
• set the 'Divider' ('dIV') parameter from 1 to 999999.
Preset value
-199999 to 999999
• set the 'Preset' ('PrSt') parameter from -199999 to 999999.
Activate the reset to load the preset value on display.
Increasing
• at the ('ModE') parameter select 'uP' to count upwards
Decreasing
(impulses received add) or select 'doWn' to count down-
wards (impulses received subtract).
• at the 'FAST' ('FASt') parameter select 'on' to activate the
fast mode. See section 1.13.3 for more information.
Configuration menu for mode 'quadrature counter' ('cnq.2').
Multiplier
Total impulses received are multiplied by the value of the
1 to 999999
'multiplier' ('MuLt') parameter and divided by the 'divider'
Divider
('dIV') parameter. Result is shown on the display..
1 to 999999
• set the 'Multiplier' ('MuLt') parameter from 1 to 999999.
Preset value
• set the 'Divider' ('dIV') parameter from 1 to 999999.
-199999 to 999999
• set the 'Preset' ('PrSt') parameter from -199999 to 999999.
Activate the reset to load the preset value on display.
1 imp. per cycle
• at the 'Quadrature edges' ('q.124') parameter select the
2 imp. per cycle
number of edges to consider. Select '1--1' for 1 impulse
4 imp. per cycle
per quadrature cycle, '1--2' for 2 impulses per quadrature
cycle, '1--4' for 4 impulses per quadrature cycle.
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