nader NDW3 Series Manual page 57

4.4.6 Remote intelligent I/O module NWDF1-C8/S12/SC64/SCM423
 The remote intelligent I/O module is a simple, practical and reliable monitoring communication
module(installed with a 35mm standard guide rail), which enables the remote communication, remote
control and remote measurement of the system via the standard RS485 interface and ModBus-RTU
protocol. When using a non-communication circuit breaker, users can monitor the corresponding power
distribution circuit via the module. Users can remotely monitor the circuit current, circuit breaker on-off
status, fault status and other important information.
 After the module is energized, the power/status indicator will flash quickly (0.5s on/0.5s off) while
the rest indicators will be constantly on for 1s and then enter into the working state. During this period, any
input, output and communication are invalid. After normal startup, this module can realize the following
functions: Setting the communication parameters by pressing the key (communication initialization
button); detecting the current input, i.e. the analog input; detecting the digital input, i.e. the passive dry
contact input; controlling the digital output, that is, self-holding output/pulse output.
 NWDF1-SCM423 features 4 common-side switch inputs, 2 relay outputs and 3 5A current inputs.
Users can know the 3-phase current and 4-channel switch of the feeder line (such as: switch on-off status,
fault status, etc.) via it combined with inputs & outputs of the circuit breaker and the standard current
transformer in the line.
 NWDF1-S12 features 12 common-side switch inputs. Users can learn the on-off status up to 12
circuit breakers or the on-off status and fault status of 6 circuit breakers.
 NWDF1-C8 has 4 groups of 8 relay outputs, for controlling the on-off status of 4 circuit breakers.
 NWDF1-SC64 features 6 switch inputs and 4 relay outputs, for monitoring its important status
while controlling the circuit breaker.
 See the table below for general parameters
Working power
supply
Communication
Internal & confidential file
File No.:NDT2920202
Nominal voltage
Allowable input range 18V~36VDC
Isolation voltage
Reverse polarity
effects
Voltage mismatch
Voltage sag
interface
Optional Modbus
address
Baud rate
Parity bit
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24VDC
1000Vrms
Does not work, but does not damage the module
Voltage above 40VDC may cause the permanent
damage of the module
Sag for 10ms can still work without interruption
Standard RS485, 2-wire, Modbus RTU
1～247
1200/2400/4800/9600/19200/38400bps
CRC check, without support for parity
File Version:4