Michell Instruments QMA401, Руководство пользователя

Страница: 76 / 102

QMA401 User’s Manual
66 97450 Issue 2, March 2018
APPENDIX C
Appendix C Modbus Holding Register Map
All the data values relating to the QMA601 are stored in holding registers. Each of these registers
is two bytes (16-bits wide). Some of these registers contain instrument specific values e.g. its own
unique system address, IP address values, etc. Others registers hold specific real time data such as
temperature.
Each Modbus message has a two part address code, one for the low byte (bits 0 through 7) and one
for the high byte (bits 8 through 15). The facility exists for multiple registers, specified by a high and
low byte contained in the query message, to be addressed and read by the same message.
The table below describes the instruments' registers with their respective address locations, together
with their relevant register configurations and register map definitions.
The register maps below the table define the data allocated to each bit/byte for each register type.
Address
#
Function Description Read/
Write
Default Register
Config
Notes/ Real Value
Range
0 ModBus Configuration R/W C
1 System Configuration R/W D
2 Alarm Configuration R/W E
3 Analogue Output Configuration R/W F
4 Internal Logging Configuration R/W U
5
MFC Span in mlm / Gas Number for flow
rate and mol weight correction
R/W S
6 PID – Proportional Value R/W A3 0.01-100.00%
7 PID – Integral Value R/W A3 0.01-1000.0%
8 PID – Derivative Value R/W A3 0.01-100.00%
9
Warning Relay Alarm warning selection
mask
R/W M
10
Dryer Capacity (ppm) / Moist Gen Capacity
(days)
R/W 255 / 103 V
11 Signal Filter Settings R/W W
12 Alarm1 – Low Set point R/W See App A
13 Alarm1 – High Set point R/W See App A
14 Alarm2 – Low Set point R/W See App A
15 Alarm2 – High Set point R/W See App A
16 Alarm3 – Low Set point R/W See App A
17 Alarm3 – High Set point R/W See App A
18 Analogue Out 1 – Low Set point R/W See App A
19 Analogue Out 1 – High Set point R/W See App A
20 Analogue Out 2 – Low Set point R/W See App A
21 Analogue Out 2 – High Set point R/W See App A
22 Fixed Pressure Input Value R/W See App A
23 Next Calibration – Configuration R/W P1
24 User low ppmV limit R/W A3 0.00 to 0.10
25 Next Calibration – Intervals between cal R/W P2
26
Next Calibration – External Cal Val – Hi
Word
R/W I 0.01 to 2000.00 ppmv
27
Next Calibration – External Cal Val – Lo
Word
R/W I 0.01 to 2000 .00ppmv
28 Last Cal Day/Month/Year R J
29 Last Cal Details R/W K
SCF can be set (for
factory calibration)
30 Last Cal - 1 Day/Month/Year R J