Sensor Electronics SEC Millenium Series Instruction And Operation Manual page 343

Overall SEC 3120 Modbus Register Map
Internal
Register
00000 - 01999
02000 - 02099
02100 - 02199
02200 - 02299
02300 - 02399
02400 - 02499
02500 - 02599
02600 - 02699
02700 - 02799
02800 - 02899
02900 - 02999
03000 - 03999
04000 - 04999
05000 - 05499
05500 - 05999
06000 - 06999
07000 - 07499
07500 - 07999
08000 - 08999
09000 - 09998
Memory Map – 16-bit Interface Holding Registers Overview
The SEC 3120 implements the 16-bit Modbus interface by breaking the address
region into ten classes (unit and sensors) and eight plus one sensor sub-regions (each
sensor region repeats the same command set with the same relative offsets) as shown
previously.
Region 0 applies a sub-set of written values to ALL logical sensors, while regions
1 – 8 apply to each individual logical sensor, and region 9 contains 3120 unit specific
(non-sensor) information. The entire 16-bit region is shown previously in green.
Within the sensor regions, the same information/register address offsets are
repeated, containing gas concentration, alarm set points, sensor status, etc. (relative
offsets 42x01 – 42x99, where x = sensor number 1 – 8).
Within the unit specific region (9), the holding register addresses are absolute (42901 =
operating status, 42902 = fault relay reason code, etc.).
SEC 3120 16-bit Modbus Manual
For Version 1.2 and above
Modbus Holding
Register
40001 - 42000
42001 - 42100
42101 - 42200
42201 - 42300
42301 - 42400
42401 - 42500
42501 - 42600
42601 - 42700
42701 - 42800
42801 - 42900
42901 - 43000
43001 - 44000
44001 - 45000
45001 - 45500
45501 - 46000
46001 - 47000
47001 - 47500
47501 - 48000
48001 - 49000
49001 - 49999
Page 4 Of 46
December 2012
Region Description
Reserved for coil registers- future
16-bit Sensor ALL apply region (region 0)
16-bit Sensor 1 region
16-bit Sensor 2 region
16-bit Sensor 3 region
16-bit Sensor 4 region
16-bit Sensor 5 region
16-bit Sensor 6 region
16-bit Sensor 7 region
16-bit Sensor 8 region
16-bit 3120 unit region (region 9)
Reserved for SEC HMI Legacy
Reserved for SEC HMI Legacy
Reserved for SEC 32-bit future
Reserved for SEC 32-bit future
Reserved for future use
Reserved for SEC 32-bit future
Reserved for SEC 32-bit future
Reserved for SEC HMI Advanced SID
Reserved for SEC HMI Legacy
Sensor Electronics Corporation
P/N 1580282, Rev. 1, 20121228