NORD Drivesystems BU0940 - Manual (Page 35)

4 Parameter modules
BU 0940 GB-3612 35
Function module Instance module Write parameter Read parameter
Para_PPO1+2R Inst_PPO1+2R - 16Bit
Para_PPO1+2W16 Inst_PPO1+2W_16 16Bit 16Bit
Para_PPO1+2W32 Inst_PPO1+2W_32 32Bit 32Bit
Table 7: Assignment of function modules
The description of the inputs and outputs is summarised in Section 4.3.
Pos : 31 /Anl eitungen/ SPS - Baus tei ne/Paramet erbaust eine/ Aufgabe Paramet erbaus tei ne f ür den az yklisc hen D at enver kehr @ 1 \mod_1338553510596_388. doc x @ 27230 @ 3 @ 1
4.1.2 Purpose of parameter modules for acyclic data communication
The function modules "Para_acyc+…" are called up in the cyclic section of the program, however they
operation in the acyclic communication process. In this way, access to the data of a frequency inverter
must not necessarily be concluded within a cycle of the PLC program, but rather can be continued in
the following program cycle. In addition to the parameter modules, the associated instance modules
"Inst_..." are also required.
Example:
Function module: Para_acyc_read
Instance data module: Inst_FB204_R1632
Access on the frequency inverter is via the diagnostic address. This address was specified during the
hardware configuration and must be individually specified for each bus participant. In the modules
described here, the diagnostic address is always 4092 (see also Section 2.1.1).
Purpose:
The function module "Para_acyc+..." is used to read a specific parameter via statement of the
parameter number and index or to write this into the frequency inverter. In addition, parameters which
provide a setting facility which depends on the parameter set can also be accessed. Please refer to
the manual for the relevant frequency inverter for information regarding which parameters can be read
or written with index and/or depending on the parameter set.
Only Para_acyc_W16 and Para_acyc_W32:
When writing the parameter, a distinction can be made as to whether the data are to be written into
the RAM or into the EEPROM of the frequency inverter.
If the data are written into the EEPROM, the information is retained, even if there is a power failure,
whereas information which is written into the RAM is lost. However, the number or write cycles for an
EEPROM is limited, so that this variant for writing date should be chosen with care.
WARNING
The maximum number or write cycles on the EEPROM of the frequency inverters is limited
to 100,000 cycles. Continuous writing to the EEPROM therefore results in the destruction
of the EEPROM.
Writing to the RAM of the frequency inverter should therefore be used for writing
parameter data. The setting for this is made in parameter P560 of the frequency inverter.