3 transmission of status information, 3 transmission of status information -2 – Yokogawa RotaMASS 3-Series User Manual
Page 64
IM 01R04B08-00E-E 1st edition February 15, 2012 -00
All Rights Reserved. Copyright © 2012, Rota Yokogawa
<8. TECHNICAL DETAILS OF MODBUS COMMUNICATION>
8-2
8.3 Transmission of status information
Modbus protocol is designed to reduce overhead. Therefore there is no continuous transmission of status
information. ROTAMASS 3 Series Modbus communication type provides three holding and input registers
to read the current status of error (HR 896, IR 42), alarm (HR 912, IR 43) and warning (HR 928, IR 44)
messages at the time when the registers are being read. History information is currently not provided by
ROTAMASS and has to be created inside the host system if desired.
The number of error, alarm and warning messages corresponds with the bit number of the registers. If
several messages are present at a time, all corresponding bits are set at once.
Register
bit no.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Error
E-16 E-15 E-14 E-13 E-12 E-11 E-10
E-9
E-8
E-7
E-6
E-5
E-4
E-3
E-2
E-1
Alarm
A-16 A-15 A-14 A-13 A-12 A-11 A-10
A-9
A-8
A-7
A-6
A-5
A-4
A-3
A-2
A-1
Warning
W-16 W-15 W-14 W-13 W-12 W-11 W-10 W-9
W-8
W-7
W-6
W-5
W-4
W-3
W-2
W-1
For a detailed description of meaning of and countermeasure for each error, alarm and warning message
please see table on next page.