Next NI2400 User Manual page 47

4
DATALOGGER
NI2400
Sensor Acquired
This register is set to 1 when sensor is acquired and a new data is available. SCADA (or
Modbus Master) reads the updated register and reset it to 0 by using Coils Functions. In
this way the system is ready to note the presence of a new acquisition.
This BIT is also accessible through read/write coils functions.
Coils are mapped on flag "Sensor Acquired" having referral to base address of each sen-
sor.
To obtain Coil address of a sensor, Use the following formula:
Coil Address = Base Address/10
Base Address computation will be shown in next pages.
Example 1
Channel: CH4
Base Address: 30
Coil Address: 3
Example 2
Channel: DIG2
Base Address: 90
Coil Address: 9
By using Coil functions, Modbus Master will be able to read the entire Coil Vector (858
sensors) in a single Modbus transaction, to understand acquired sensors and to read only
updated measures, without the need to read the 10 registers block every time.
Input X Valid
It indicates if matching Inputs are valid or not.
If sensor is configured as Volt 1CH, registers status will be:
• Input A Valid: 1
• Input B Valid: 0
• Input temp Valid: 0
For a digital single channel sensor, registers status will be:
• Input A Valid: 1
• Input temp Valid: 1
• Input B Valid: 0
Input X Alarm
It indicates if matching inputs are in alarm.
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4
DATALOGGER
NI2400
REGISTER MAP
General
All this registers are read-only.
Only "Sensor Acquired" BIT is read-write, using Write single/multiple coils.
Analog Sensors Locations
REGISTER ADDRESS (DEC)
0-1
2-3
4-5
6-14
15
16-17
18-19
20-21
22-30
31
...
...
...
...
112-113
114-115
116-117
118-126
127
Digital Sensors Locations
BASE_DIG+0 -
BASE_DIG+1
BASE_DIG+2 -
BASE_DIG+3
092
DESCRIPTION
MSB-LSB Input A LOCAL CH1
MSB-LSB Input B LOCAL CH1
MSB-LSB Temperature LOCAL CH1
Timestamp acquisition LOCAL CH1
Flags LOCAL CH1
MSB-LSB Input A LOCAL CH2
MSB-LSB Input B LOCAL CH2
MSB-LSB Temperature LOCAL CH2
Timestamp acquisition LOCAL CH2
Flags LOCAL CH2
MSB-LSB Input A LOCAL CH8
MSB-LSB Input B LOCAL CH8
MSB-LSB Temperature LOCAL CH8
Timestamp acquisition LOCAL CH8
Flags LOCAL CH8
MSB-LSB Input A DIGITAL 1
MSB-LSB Input B DIGITAL 1
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SENSOR
CH1
CH1
CH1
CH1
CH1
CH2
CH2
CH2
CH2
CH2
CH8
CH8
CH8
CH8
CH8
DIG1
DIG1
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