S+S Regeltechnik PREMASGARD 724x - Modbus Notice D'instruction page 22

G
®
PREMASGARD
Function 06 Write Single Register &
Function 16 Write Multiple Register
Register Parameter (display)
4x0023 k factor
4x0024 Function type
Note on k factor (register 4x0023)
The computed coefficients for the volume flow display are not saved in the permanent memory
and are lost at zero voltage. They must be reset when the communication begins.
If the k factor of the manufacturer of the fan is provided in the SI unit system, the value can be applied directly.
If specified in the Imperial System of Units, the k-factor must be multiplied by the factor of 9.2846.
Selection of the function type (register 4x0024)
Type 1:
Rosenberg, Comefri,
Gebhardt Nicotra
Type 2:
Ziehl-Abegg,
EBM Papst
Type 3:
Fläkt Woods
Function 08 Diagnostics
The following sub function codes are supported
Sub Function Parameter
Code
00 Echo of transmission data
(Loopback)
01 Restart Modbus
(Reset listen-only mode)
04 Activation listen-only mode
10 Delete counter
11 Counter bus telegrams
12 Counter communication errors
(Parity, CRC, frame errors, etc.)
13 Counter exception telegrams
14 Counter slave telegrams
15 Counter telegrams without answer
Function 17 Report Slave ID
Composition of answer telegram
Byte No. Parameter
00 Number of bytes
01 Slave ID (device type)
02 Slave ID (device class)
03 Status
04 Version number (release)
05 Version number (version)
06 Version number (index)
724x - Modbus | Telegrams
Data Type
Unsigned 16 Bit 1...2000
Unsigned 8 Bit 1...3
3
= Volume flow [m /h]
= k factor
= Differential pressure of the static pressures [Pa]
3
= Air density [kg/m ]
Data Type Answer
Echo data
Echo telegram
No answer
Echo telegram
Unsigned 16 Bit All valid bus telegrams
Unsigned 16 Bit Faulty bus telegrams
Unsigned 16 Bit Error counter
Unsigned 16 Bit Slave telegrams
Unsigned 16 Bit Broadcast messages (address 0)
Data Type Answer
Unsigned 8 Bit 6
18 = PREMASGARD
Unsigned 8 Bit
Unsigned 8 Bit 30 = PREMASGARD
Unsigned 8 Bit 255 = RUN, 0 = STOP
Unsigned 8 Bit 1...9
Unsigned 8 Bit 1...99
Unsigned 8 Bit 1
22
Value Range
1...2000
1...3
® 724x
® / PREMASREG ®