STATYS
Jbus / Modbus serial link
8 OPMSTAJB0810-GB_01
ITALIANOENGLISH
7. JbuS/modbuS protocol
Reminder:
The JBUS/MODBUS protocol available on STATYS is slave and in RTU mode.
It uses the function 3 as ‘read registers’ and the function 6 as ‘write register’.
The slave number is set via the control panel or via the graphic touch screen.
Conventions:
The table addresses are written in hexadecimal, beginning with ‘0x’.
Some PLC systems request a relative address starting from 400 (0x0190) or 40001 (0x9C41), on this address
it’s necessary to add the rst address of the JBUS/MODBUS table.
Frame errors management:
In case of wrong data request, the STATYS answers with the following frame error :
Error function code Error code Cause
80 + code function 1 Function error
80 + code function 2 Addresses error
80 + code function 3 Wrong data
80 + code function 6 busy
80 + code function 8 Write register error
8. StatyS JbuS/modbuS tableS
§ TABLE Start addresses Table length in words JBUS/MODBUS FUNCTION
1 States 0x0140 4 3 READ
2 Alarms 0x0148 2 3 READ
3 Measurements 0x0220 64 3 READ
4 Permissions 0x0150 1 3 READ
5 Commands 0x0190 1 6 WRITE
8. 1. How to read data:
The identication, status and alarms tables should be read completely (this means the number of word to
read is equal to the table length).
The measurements table should be read word by word or per group, without exceed the length of the
table. (from 0x0220 to 0x025F).
8. 2. IncomIng data Structure:
Example of 6 words
123456789101112
MSB 0 LSB 0 MSB 1 LSB 1 MSB 2 LSB 2 MSB 3 LSB 3 MSB 4 LSB 4 MSB 5 LSB 5
WORD 0 WORD 1 WORD 2 WORD 3 WORD 4 WORD 5
b15 b0 b15 b0 b15 b0 b15 b0 b15 b0 b15 b0
S15 S00 S31 S16 S47 S32 S63 S48
A15 A00 A31 A16
M00 M01 M02 M03 M04 M05
