NORD Drivesystems BU0220 - Manual (Page 38)

PROFIBUS DP – Supplementary manualfor NORD Frequency Inverter SK 2xxE
38 Subject to technical amendments BU 0220 GB-0912
The system modules SFB 52 "RDREC" (read record) and SFB 53 "WRREC" to be used for acyclic data traffic in
the PLC program sequence access Slot 0 via the "diagnosis address" of the PROFIBUS DP technology unit.
The "diagnosis address" can be read out via the "object properties" of the DP slave.
Use of these system modules requires additional details of the index (see previous table) and the length,
whereby due to the transfer of parameter data via the USS protocol (includes parameter data transfer), the
length is always 8 byte (see also Section 7.2 "PROFIBUS DP PPO types").
4.2.2 Definition of PPO types
For cyclic data traffic, the Parameter- Process data Object (PPO) with which the
process data (PZD) is transferred from the DP master to the frequency inverter is
defined. The following settings may be selected:

Universal module no function

Empty Empty slot

PPO type 1 to 4 for PKW and PZD

Profibus I/O Modules to control additional input and output
signals of the bus module
4.2.2.1 Universal module
A universal module is not defined. This setting has no function.
4.2.2.2 Empty
The setting Empty must always be selected if there is no device (frequency inverter) connected to the slot or
the I/Os of the BUS module are not to be accessed.
4.2.2.3 PPO type 1 to 4
The setting of the PPO types is reserved for the connected frequency inverters (integrated into "Slots 2 - 5").
Here, each frequency inverter must be assigned the intended (required) PPO type.
With PPO types 1 and 2, both process data and parameters can be cyclically communicated between the DP
master and the frequency inverter.
With PPO types 3 and 4, only process data is transferred.
More detailed information about PPO type definitions is given in Section 7.2 "PROFIBUS DP PPO types".
The PROFIBUS DP modules (SK CU4-PBR and SK TU4-PBR- …) are equipped with an automatic PPO type
detection.
NORD Modules