KROHNE H250 M9 PROFIBUS PA EN - Manual (Page 5)

5 Supplement to Installation and Operating Instructions H 250/ESK3-PA
Important
When you set up the PROFIBUS communication network you must assign a function to each
of the 3 blocks. For the Siemens PC-S7, for example, this is done with the HW-Config tool.
The function “Empty Block” can be assigned to each block. That means that for this block
no data are transmitted in the cyclic data telegram.
An AI block is NOT allowed at block positions 2 and 3! In addition to “Empty Block” only
the totalizer functions are allowed here.
Four different totalizer functions are offered, which you can assign to blocks 2 and 3. But
the significance of cyclic data transfer (count value and status) always corresponds to that
in the chapter entitled “Significance of Measurement and Status Information”.
The differences of the four functions are:
Totalizer cyclic transmission of count value with status to master
SETTOT_TOTAL cyclic transmission of count value with status to master
cyclic control data from master to device by byte SetTot
MODETOT_TOTAL cyclic transmission of the count value with status to master
cyclic control data from master to device by byte ModeTot
SETTOT_MODETOT_TOTAL cyclic control data from master to device by byte
SetTot and then ModeTot
Both the SetTot and the ModeTot byte are transmitted cyclically from the master to the
device, when these bytes are entered as output data in the PLC configurator. The meaning
of the control bytes is:
SetTot
SetTot = 0x00: The totalizer totalizes. For the change from SetTot “0x01” or “0x02” to
“0x00”, the totalizer starts with its current count value (0.00000 or
preset value).
SetTot = 0x01: The count value of the totalizer is set to 0.00000 and remains at this
value until SetTot is reset to 0x00.
SetTot = 0x02: The count value of the totalizer is set to the value of Preset_Tot.
Preset_Tot can be written by an acyclic master (totalizer in block 2 =
slot 2; index 32; totalizer in block 3 = slot 3; index 32).
SetTot> 0x02: is not authorized.
ModeTot
ModeTot = 0x00: The totalizer totalizes all positive and negative measured values.
ModeTot = 0x01: The totalizer adds only positive measured values.
ModeTot = 0x02: The totalizer adds only negative measured values.
ModeTot = 0x03: The totalizer is interrupted and does not totalize any more measured
values.
ModeTot > 0x03: not authorized.