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FEMA ELECTRÓNICA . SERIES B . Models Bxx-C1
1.13.13 Accepted sensors and signals
The instrument accepts the usual sensors and impulse sig-
nals, and provides a list for the operator to choose his sen-
sor. It also allows to configure a wide range of parameters
to adapt the reading to other non usual sensors and signals.
The directly selectable sensors are:
• Mechanical contact (free potential contact)
• Namur
• NPN and PNP, 2 or 3 wires
• Push-pull
• TTL and CMOS
• Pickup
• AC voltage signals up to 30 Vp (inductive)
The configurable parameters are:
• Pull-up / pull-down resistors can be enabled or disabled
independently for channel 'A', channel 'B' and the reset
channel.
• The trigger level can be manually configured to any value
between 0.0 V and 3.9 V. While modifying the trigger level
parameter (press 'UP' (5) to increase, press 'LE' (3) to
decrease), the two segments to the left show the actual
Sensor
Connections
(0 signal Vexc)
Mechanical
0 V 'A'
contact
'A' Vexc
Namur
0 V 'A'
NPN 2 wires
0 V 'A' Vexc
NPN 3 wires
0 V 'A'
PNP 2 wires
0 V 'A' Vexc
PNP 3 wires
0 V 'A' Vexc
Push-pull
TTL
CMOS
0 V 'A'
Pick-up
AC<30 Vp
0 V 'A'
Inductive
Table 15 - Parameters configured and connections for listed sensors. Channel 'B' ap-
plies the same connections as indicated for channel 'A'
16
Pulls
Vexc.
Antirrebound
pull-up
no
100 mSeg. 2,5 Vdc
pull-down 9 Vdc
pull-up
18 Vdc
pull-up
18 Vdc
pull-down 18 Vdc
pull-down 18 Vdc
no
18 Vdc
no
5 Vdc
no
no
state '1' or '0' for channels 'A' and 'B'. This information
helps to easily identify the real trigger level. When the left
segments switch from 'high' to 'low' means that the trig-
ger level for channels 'A' and 'B' has been reached. The
same trigger level applies to channels 'A', 'B' and reset.
• Activation by rising or falling edges can be configured.
Channels 'A' and 'B' share the same configuration. Reset
has its own independent configuration.
• Excitation voltage can be configured to 5 V, 9 V, 15 V o 18 V,
or even power off the excitation voltage.
• An antirrebound filter is configurable, by setting a time
between 0 and 1000 mSeconds. When an impulse is
received,the instrument inhibits the counting of new im-
pulses for the time configured.
See Table 15 below for a list of directly selectable sensors,
the associated configuration parameters for each one and
connections. Parameters can be later on modified through
the configuration menu.
For signal connections and reset connections, see section
1.8.
Trigger
filter
level
Level '1'
Level '0'
no
3,0 Vdc
no
2,5 Vdc
Vdc
no
2,5 Vdc
no
2,5 Vdc
no
2,5 Vdc
no
2,5 Vdc
no
2,5 Vdc
'1'
'0'
no
0 Vdc
Figure 6 - 'Trigger sense' for detection of trig-
ger level
channel 'A'
channel 'B'
'trigger' level
'Trigger Sense' leds
'Trigger' level
at 1.8 Vdc
t
t
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