31
ENG
c.pCO sis
tem
a
+
0300057EN
re
l. 1.2 - 29.05.2017
The fast digital input can be used as a frequency meter. The count is
performed on the rising edge of the pulse. The pulse generator device
will have one digital output with transistor optocoupler, which will be
connected to the input as shown in the figure. For details on the input
signal see the Technical Specifications table (see chap. 12).
Note:
the application program shows the frequency values using
specific variables. If the inputs are configured as counters, the counter is
reset by the application program.
Example:
t
t
inp
u
t
co
u
nt
Fig. 5.k
Note:
in the case of fans with current output and high series
resistance, the reading of the pulses may depend on the current. The
current value can be configured in the c.design I/O Editor.
C
onnecting non-optically-isolated analogue outputs
There is no particular restriction on the number of outputs that can
be connected. For details on the output signal see the Technical
Specifications table (see chap. 12).
Example: analogue/PWM output connection diagram.
U1
U2
U3
GND
+VDC
+V
term
GND
+5 V
REF
U4
GND
U5
GND
VG
VG0
Y1
Y2
Y3
Y4
ID
1
J24
J2
J3
J4
ID1
Vo
u
t
Vo
u
t
Fig. 5.l
Key
Controller terminals
Description
U1
Analogue output 1
GND
U2
Analogue output 2
GND
U3
Analogue output 3
GND
Note:
the analogue outputs cannot be connected in parallel.
5.3 Digital
inputs
The controller features digital inputs for connecting safety devices, alarms,
device status indicators and remote switches. See the table of technical
specifications for the maximum cable length cables (see chap. 12).
c.p
CO
mini
The digital inputs are not optically-isolated and have voltage-free
contacts. The following figure shows how to connect the digital inputs:
U1
U2
U3
GND
U4
U5
U6
GND
U7
U8
U9
U10
GND
J1
G
G0
Vbat
+5VREF
GND
+V DC
J9
Y1
GND
ID2
ID1
Y2
GND
J8
J7
J2
Fig. 5.m
c.p
CO
S
mall...Extralarge
These inputs are all optically isolated from the other terminals. They can
work at 24 Vac (+10/-15%) or 28 to 36 Vdc (-20/+10%) (indicated as ID*),
and some at 230 Vac (indicated as IDH*), see as reference figure below.
Note:
•
if the control voltage is drawn in parallel with a coil, install a dedicated
RC filter in parallel with the coil (typical ratings are 100 Ω, 0.5 μF, 630 V);
•
if the digital inputs are connected to safety systems (alarms), the
presence of voltage across the contact should be taken as the normal
operating condition, while no voltage represents an alarm situation.
This will ensure that any interruption (or disconnection) of the input
will also be signalled;
•
do not connect the neutral in place of an open digital input;
•
always interrupt the phase.
Important:
•
to avoid electromagnetic interference, keep the probe and digital
input cables separate from the power cables as much as possible (at
least 3 cm). Never run power cables and probe signal cables in the
same conduits (including the ones in the electrical panels.
24 Vac digital inputs (c.p
CO
S
mall... Extralarge only)
Digital inputs ID... can be controlled at 24 Vac.
Note:
•
the digital inputs are only functionally isolated from the rest of the
controller;
•
to keep the digital inputs optically isolated a separate power supply is
needed for each input;
•
the digital inputs can be powered at a different voltage from the rest
of the controller.
C
able cross-section
For remote connections to the digital inputs (length <50 m), use cables
with a cross-section = 0.25 (mm
2
)
Important:
If the controller is installed in an industrial environment
(standard EN 61000-6-2) the connections must be less than 30 m long. Do
not exceed this length to avoid measurement errors.