74
SOCOMEC - Réf. : 678 623 G GB
COMMUNICATION
The JBUS / MODBUS
®
used by the ATI
involves a dialogue using a master-
slave hierarchical structure. There are
two possible dialogues:
• the master communicates with a
slave (ATI) and waits for its reply
• the master communicates with all the
slaves (ATI) without waiting for their
reply.
The mode of communication is the
RTU (Remote Terminal Unit) using
hexadecimal characters of at least 8
bits.
According to the JBUS / MODBUS
®
protocol, transmission time must be
less than 3 silences, i.e. the emission
time of 3 characters so that the mes-
sage is processed by the ATI.
To correctly use information, the
following functions are important:
3 : to read n words (maximum 128).
6 : to write one word.
8 : to diagnose exchanges between
the master and the slave via
meters 1, 3, 4, 5 and 6.
16 : to write n words (maximum 128).
LIST OF PARAMETERS TO BE DISPLAYED (FUNCTION 3)
Table of values on 2 words
The standard communications frame
consists of :
Slave address
Function code
Address
Data
CRC 16
NB:
When selecting slave address 0, a
message is sent to all the instruments
present on the network (only for func-
tions 6 and 16).
Comment:
The maximum reply time is 250 ms.
Decimal Hexa Number
Address
Address
of words
Variable
Units
768
300
2
I1
A/100
770
302
2
I2
A/100
772
304
2
I3
A/100
774
306
2
In
A/100
776
308
2
U12Main
V/100
778
30A
2
U23Main
V/100
780
30C
2
U31Main
V/100
782
30E
2
V1Main
V/100
784
310
2
V2Main
V/100
786
312
2
V3Main
V/100
788
314
2
Freq.Main
Hz/100
790
316
2
Active power (total)
kW/100
792
318
2
Reactive power (total) kVar/100
794
31A
2
Apparent power (total) kVA/100
796
31C
2
Power factor
0,001
880
370
2
U12 Gen
V/100
882
372
2
U23 Gen
V/100
884
374
2
U31Gen
V/100
886
376
2
V1Gen
V/100
888
378
2
V2Gen
V/100
890
37A
2
V3Gen
V/100
892
37C
2
FreqGen
Hz/100
894
37E
1
1MT
V/100
895
37F
1
2MT
V/100
896
380
1
AT
s
897
381
1
DBT
s
898
382
1
ROT
s
Example :
To read U31 gen = 228,89, the
following message should be sent:
Содержание ATI 1000 A
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