NC400-6 Counter
NOVUS AUTOMATION
3/7
Select ADD/SUB:
COUNT2 input defines if COUNT1 input is
progressive or regressive.
QUADRATURE:
Bidirectional counting mode that uses two
counting inputs to determine if counting is
progressive or regressive. In this counting
mode, the
Coun.tY
parameter is ignored
and the counting mode is always fast.
QUADRATURE 2X:
The same as the QUADRATURE mode,
but it counts twice as fast, increasing
resolution. In this counting mode, the
Coun.tY
parameter is ignored and the
counting mode is always fast.
The counter is incremented or decremented whenever the voltage
level in the counting inputs increases (rising edge) except in the fast
counting mode (
Coun.tY
=
1
) in COUNT1 input.
The most representative counting modes are shown in
Figures 2
to
5
. Low and High levels in the following figures correspond to voltage
levels in these inputs with PNP sensor or Voltage pulse. For the case
of NPN sensors or dry contact, signals will be reversed.
Figure 2
– Counting modes 1 and 5
Figure 3
– Counting modes 7 and 8
Figure 4
– Counting mode 13 (quadrature)
Figure 5
– Counting mode 15 (quadrature 2x)
SERIAL COMMUNICATION (OPTIONAL)
Optionally, NC400-6 can be delivered with an asynchronous master-
slave serial communication interface RS-485 to communicate with a
supervisor computer (master). The counter is always the slave.
Communication always start with the master, which sends a
command to the slave address with whom it wants to communicate.
The addressed slave undertakes the command and sends the
response to the master. NC400-6 also accepts
broadcast
commands.
FEATURES
•
Signals compliant with the RS-485 standard. MODBUS (RTU)
protocol. 2 wire connection between 1 master and up to 31 (able
to address up to 247) instruments in bus topology.
Communication signals are electrically isolated from the rest of
the device;
•
Maximum connection distance: 1000 meters;
•
NC400-6 disconnection time: Maximum 2 ms after the last byte;
•
Fixed communication speed (
Baud Rate
): 9600 bps;
•
Number of data bits: 8, no parity. Number of
stop
bits: 1;
•
Transmission onset and response time: maximum of 100 ms
after command.
RS-485 signals are:
D1 D D + B
Bidirectional data line.
Terminal 16
D0 D - A
Reserved bidirectional data line.
Terminal 17
C
Optimal connection that enhances
the communication performance.
Terminal 18
GND
CONFIGURATION OF SERIAL COMMUNICATION PARAMETERS
Parameter that must be configured when the serial communication
used:
Addres
NC400-6 counter communication address.
OVERFLOW AND UNDERFLOW
If the counter is at
0
and it receives a pulse to decrement, the
counter will show
999.999
and turn the OVFL flag on. This means
that the counter rolls to
999.999
. If it increments beyond this, it will
roll back to
0
, clearing OVFL flag.
On a similar way, when the counter is at
999.999
and it is
increased, it will roll to
0
and turn the OVFL flag on. When it
decreases again below
0
, it will turn the flag off and roll back to
999.999
.
Note
: The setpoints and output control have no effect while OVFL
flag is on, except those who are cleared by time.
INSTALLATION
PANEL MOUNT
NC400-6 must be installed in a papel. To install, follow the steps
below:
1.
Make a panel cutout of 45.5 x 45.5 mm;
2.
Remove the clips from NC400-6;
3.
Insert NC400-6 in the frontal panel cutout;
4.
Replace clips in NC400-6 and press them tightly to clamp the
counter to the panel.
INSTALLATION RECOMMENDATIONS
•
Input signal wires must be installed in grounded conduits and
away from power or contactor wires+
•
Instruments must be powered only by an exclusive power supply.
•
System failure should always be taken into account when
designing a control panel to avoid irreversible damage to
equipment or people. The output internal relay does not warrant
total protection.
•
Installing RC filters (47 Ohms and 100 nF, serial) is strongly
recommended at contactor coils or any other inductors.
