Supplement to User Manual - ENGLISH Modbus Server
SU_ModbusV2-8, 2015-03-02 75
11.3 Request of the Totalizer for the last 24 h (Request in Intervals)
The values of the totalizers for the last 24 h can be requested for the following physical quantities:
• volumetric flow rate
• standard volumetric flow rate
• mass flow rate
• heat flow rate
The values of the totalizers are stored once per day according to the trigger time set for the last three days (shift register).
Trigger time (default): 0:00 am
Different trigger times can be defined (see
Tab. 11.3).
For the Modbus register addresses of the values of the totalizers see Tab. 11.4.
Tab. 11.2: Reset of the totalizers to zero
Modbus register address explanation character hexadecimal
100 channel ID
measuring channels A...D 0x41...0x44
calculation channels Z...Y 0x5A...0x59
all channels * 0x2A
101 totalizer ID
positive totalizer + 0x2B
negative totalizer - 0x2D
both totalizers * 0x2A
220 reset 0x01
Tab. 11.3: Defining the trigger time
value data format Modbus register address
trigger time integer 32 bit
1st byte (lsb): second
2nd byte: minute
3rd byte: hour
4th byte: not used
23000 ...23001
Example: Defining the trigger time on February 16th, 2014
Trigger time: 2:15 pm
Every day at 2:15 pm the current values of the totalizers for the last 24 h are stored.
On February 20th, 2014 after 2:15 pm, the values of the totalizer of the following days can be
requested:
1st day: (February 19th, 2:15 pm to February 20th, 2014, 2:15 pm)
2nd day: (February 18th, 2:15 pm to February 19th, 2014, 2:15 pm)
3rd day: (February 17th, 2:15 pm to February 18th, 2014, 2:15 pm)
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