Omega DPF20 Series User Manual

27
DPF20 Frequency, rate, total or period counter Instruction Manual
Opon RTU
Output type Modbus RTU communicaon port
Funcon implemented 4 (Read_Input_Registers)
Addresses 01 to 247
Excepon codes see secon
Registers see secon 2.3.1
Bus RS-485
speed 57.6 Kbps to 600 bps
Data format 8n1 (standard), 8o1, 8n2, 8e1
bus terminator not included
Isolaon 1000 Vdc
Conguraon 3 buon front keypad
Temperature operaon from 0 to 50 ºC
storage from -20 to +70 ºC
Factory conguraon ‘Address 1’
‘Speed 19.2 Kbps’
‘Format 8n1’
‘Decimal point Auto’
Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘Opt.3’
Power
Opt.2
Opt.1
Opt.3
B A G
B A G
Signal
B A G
Rear view DPF20
Register Name Descripon Size Refresh Value : Series M Value : Series K and S
0 DISPLAY1_L
Display value
16 bits
same
as display
999999 to -199999 9999 to -1999
1 DISPLAY1_H 16 bits
2 DECIMALS1
Decimals on display
16 bits
0 to 6
0 to 4
3 MAXMEM_L
Memory of maximum
16 bits
every
30 seconds
999999 to -199999 9999 to -1999
4 MAXMEM_H 16 bits
5 MINMEM_L
Memory of minimum
16 bits
999999 to -199999 9999 to -1999
6 MINMEM_H 16 bits
7 SETPOINT1_L
Setpoint 1 value
16 bits
every
2 seconds
999999 to -199999 9999 to -1999
8 SETPOINT1_H 16 bits
9 SETPOINT2_L
Setpoint 2 value
16 bits
999999 to -199999 9999 to -1999
10 SETPOINT2_H 16 bits
11 SETPOINT3_L
Setpoint 3 value
16 bits
999999 to -199999 9999 to -1999*
12 SETPOINT3_H 16 bits
13 STATUS
Alarm status
Instrument status
16 bits
same
as display
bit 0...7 alarm status
bit 8...16 instrument status
14 a 16 Reserved
Reserved
16 x 3 bits
Not accessible
Not accessible
Table 10 - Registers accessible via MODBUS-RTU.
All registers codied as binary numbers. Negave values are codied in two’s complement.
2.3 Module RTU
Module RTU provides 1 Modbus RTU communicaons port, to install
in DPF20 digital panel meters. Enables protocol funcon ‘4’ (‘Read In-
put Registers’) to access the instrument registers (reading value, alarm
status, memory of maximum and minimum, setpoint values, ...).
Protocol conguraon is performed from the frontal keypad of the
meter, by seng the parameters at the opons conguraon menu
(‘Opt.1’, ‘Opt.2’ or ‘Opt.3’ depending on the posion the module is
installed).
Up to a maximum of 3 RTU modules can be installed in a single in-
strument, all modules isolated between them and isolated from all
other circuits.
Modules RTU can be ordered pre-installed into a DPF20 digital panel
meter, or standalone for delayed installaon, as they do not require
soldering or special conguraon.
Module Connecons
Module RTU - Modbus RTU
Terminal B B signal from RS-485 bus
Terminal A A signal from RS-485 bus
Terminal G GND
Table 11 - Connecon terminals
2.3.1 Accessible registers

Omega DPF20 Series Specifications

General

Brand	Omega
Model	DPF20 Series
Category	Measuring Instruments
Language	English