NOVUS N120/N125 CONTROLLER - Manual

1
N120/N125 CONTROLLER
Communication Manual – V1.1x
1. SERIAL COMMUNICATION
1.1 COMMUNICATION INTERFACE
The optional serial interface RS485 allows to address up to 247 controllers in a network
communicating remotely with a host computer or master controller.
RS485 Interface
 Compatible line signals with RS485 standard
 3 wire connection from master to up to 31 slaves indicators in a multidrop bus. It is
possible address 247 nodes with multiple outputs converters.
 Maximum communication distance: 1000 meters
 The RS485 signals are:
D1 = D: Bidirectional data line.
D0 = D: Bidirectional inverted data line.
C = GND: Optional connection which left communication better.
General Characteristics
 Optically isolated serial interface
 Programmable baud rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600 or
115200 bps.
 Data Bits: 8
 Parity: None, Even or Odd.
 Stop Bits: 1
Communication Protocol
The MOSBUS RTU slave is implemented, available in most SCADA softwares in the
market.
All configurable parameters can be accessed (for reading or writing) through the
Registers Table. Broadcast commands are supported as well (address 0).
The available Modbus commands are:
03 - Read Holding Register
05 - Force Single Coil (Force Digital Output state)
06 - Preset Single Register
16 - Preset Multiple Registers (Block write to multiple holding registers)
The registers are arranged in a table in such a way that several registers can be read in
the same request.
1.2 CONFIGURATION OF SERIAL COMMUNICATION PARAMETERS
Two parameters must be configured in the device for serial communication:
bavd : Baud rate. All devices with same baud rate.
addr : Device communication address. Each device must have an exclusive address.
prty : Paraty.
1.3 REGISTERS TABLE
Equivalent to the registers referenced as 4XXXX.
The holding registers are basically a list of the internal indicator parameters. All registers
above address 12 can be read or written. The registers up to this address in more are
read only. Please verify each case. Each table parameter is a 16 bits two complement
signed word.
Holding
Registers
Parameter Register Description
0000 Active SP Read: Active control SP (main SP, from ramp and soak or
from remote SP).
Write: to main SP
Range: from spll to spkl.
0001 PV Read: Process Variable.
Write: Not allowed.
Range: Minimum value is the one configured in spll and
the maximum value is the one configured in spkl.
Decimal point position depends on dppo value.
In case of temperature reading, the value read is always
multiplied by 10, independently of dppo value.
0002 MV Read: Output Power in automatic or manual mode.
Write: Not allowed. See address 28.
Range: 0 to 1000 (0.0 to 100.0%).
0003 Remote SP
type
Read/Write: Selected input type for remote SP.
Range: 0 to 3
0004 Display
value
Read: Current value shown on display.
Write: Current value shown on display.
Range: -1999 to 9999. The range depends on the
displayed parameter.
0005 Screen
number
Read: Current screen number.
Write: not allowed. Range: 0000h to 060Ch
Prompt number format: XXYYh, where:
XX  menu cycle number (check item 4 -
INSTALLATION/CONNECTIONS)
YY  prompt number (index).
0006 Status Word
1
Read: Status bits. See table 2. Write: not allowed.
Read values: See table 2
0007 Software
Version
Read: The firmware version of controller.
Write: not allowed.
Read values: If V1.00, the read value will be 100.
0008 ID Read: controller identification number. Write: not allowed.
Values: 32 – N120 Controller
37 – N125
Other values: special instruments.
0009 Status Word 2 Read: Status bits. Write: not allowed.
Read values: See table 2.
0010 Status Word 3 Read: Status bits. Write: not allowed.
Read values: See table 2.
0011
Ir
Integral Rate (in repetitions/min)
Range: 0 to 9999 (0.00 to 99.99)
0012 Dt Derivative Time (in seconds).
Range: 0 to 3000 (0.0 to 300.0)
0013 Pb Proportional Band (in percentage)
Range: 0 to 5000 (0.0 to 500.0)
0014 tbas Read/Write: Time base for the ramp and soak programs.
Range: 0 – 1 (seconds/minutes)
0015 Ct Cycle Time (PWM, in seconds)
Range: 5 to 1000 (0.5 to 100.0)
0016 Freq Read/Write: Mains frequency.
Range: 0 – 1 (60/50Hz)
0017 kyst On/Off Control Hysteresis (in selected type engineering
unit).
Range: 0 to spkl - spll
0018 fltr Read/Write: PV digital filter gain.
Range: 0 – 20
0019 ovll Output Low Limit (minimum output power)
Range: 0 to 1000 (0.0 to 100.0%).
0020 ovkl Output High Limit (minimum output power)
Range: 0 to 1000 (0.0 to 100.0%).
0021 Reserved Internal use.
0022 Reserved Internal use.