Festo CAMC-G-S3 Manual page 60

2 Product description of safety module CAMC-G-S3
Term/abbreviation
DIN40A/..., DIN40B/...
GLITCH FILTER
LPF
COMPARATOR + LOGIC
LIN_x
[5x-x] xxx_ERR
Tab. 2.22 Legend for Fig. 2.11
The signal levels at the inputs DIN44 to DIN49 are first dejammed in a preliminary EMC filter, the "Glitch
Filter". The filter time constant is 500 μs and cannot be parameterised.
After this first filter, a second "LPF" filter, which can be parameterised using the parameter "Filter time
constant" (P02.18), follows for each input signal, and is designed as a programmable Mono-Flop. It is
used for the following purposes:
– filtering out of external test pulses, e. g. of an active sensor with OSSD outputs.
– filtering out of the test pulses of DOUT4x in the case of passive sensors.
– filtering out of contact bounces.
In a downstream logic operation with comparator, the two input signals are used to form the logical
control signal LIN_D44/.../49 (LIN_D44/.../49 = 1 equates to Control function requested). In this sec­
tion, the test pulses at the input are also analysed.
The sensor type can be selected using the parameter "Sensor type" (P02.28 ... P02.2D).
Input DIN44/ ... /49
DIN44 / ... / 49
Status LIN_D44 / ... /49
Tab. 2.23 Inputs switching antivalently
The logical status directly represents the voltage level at the input - in contrast to the
two-channel inputs DIN40...DIN43, which follow the idle current principle. This means
that the inputs are designed for control functions, such as the mode selector switch,
which require positive logic.
If you wish to use the single-channel inputs or their combination to request safety func­
tions, the idle current principle should be observed:
Then, use the inverted logic signal to request the safety function, e. g. Example:
60
Explanation
Two-channel digital inputs DIN40A/DIN40B ...
Filter for interference
Low-pass filter
Comparator and logic
Logical inputs ...
Internal error signal, error 5x-x
Idle state Control function requested
0 V 24 V
0 1
Festo – GDCP-CAMC-G-S3-EN – 1406NH – English