GE Industrial Solutions 6KCV300DVN - Manual (Page 31)

6KCV300DVN
4 31
—————— POLLING FUNCTION ——————
4.0 POLLING FUNCTION
This type of DeviceNet-function is used for a fast cyclic exchange of Drive-
parameters between Master and 6KCV300DVN card.
The Drive-parameters involved in this exchange may be set from the menu of
the keypad.
The characteristics of the Polling-function are:
1. The data frame length is fixed in 8 bytes for both directions (Slave->Master
and Master->Slave); in this way it is not necessary the frame fragmentation
and a time effective data transfer is achieved. With 8 bytes 4 Drive
parameters of one Word each in Input and Output can be transferred
cyclically.
2. The board, as it is a Slave, during the Polling consumes Output data and
produces Input data as response.
4.1 SETTING OF POLLING PARAMETERS
The configuration of the Drive parameters transferred via Polling may be set
by the drive keypad and stored on the E2PROM of the 6KCV300DVN board.
4 Words totally from Slave to Master and 4 Words from Master to Slave are
handled.
For the configuration of the Polling parameters a new communication object is
defined.
The Polling parameters may be configured in every communication status.
The setting is protected by a Password.
Default value: all at zero.
4.1.1 Configuration object of the Polling parameters S->M
For the assignment of the Drive parameters to the 4 Words of Polling from
Slave to Master the new object “POLL S->M CFG” with an identifier of a
special class is defined.
The object is composed as follows:
- Class ID: 68h.
- Class Attribute: Revision