Handling with VIPA data handling blocks Manual BG41/BG42/BG43
4-20 Rev. 99/49
4.1.7 Handling with procedure 3964(R)
4.1.7.1 General
The building blocks BG41, BG42 and BG43 can be operated with the procedure 3964(R). It is not
necessary to select the procedure with the FB100 or the FB101, as this is carried out by the FB37
(SYNCHRON).
A 3964 (R) operation is not possible on channel 3 of the BG43!
If the 3964 (R) operation is needed on all three channels, the firmware
4017v5x is to be used.
The procedure 3964 differs from 3964R in only two aspects of the procedure:
•= The BCC byte is dropped in the procedure 3964. DLE/ETX applies for the end of the
telegram.
•= Acknowledgement delay time (standard requirements)
In procedure 3964: QVZ = 550 ms.
In procedure 3964R: QVZ = 2000 ms
In order to be able to work with procedure 3964 or 3964R, the following VIPA data handling blocks
have been made available:
SYNCHRON FB37 (from firmware level 401xV50 and all 4118)
With this function block the building block is set to operate with the 3964(R) procedure, the baud
rate and format of data transmission is selected and the size of the block and priority are set.
Difference to FB30: Input of a character delay time (ZVZ)
Input of an acknowledgement delay time (QVZ)
SYNCHRON FB30 (up to firmware level 401xV41)
This function block is to be used instead of FB37, if the firmware level 4.1 or older are to be used.
RECEIVE FB31
With this function block, telegrams are received from partner equipment.
SEND FB33
This function block is used to send an output telegram to partner equipment.
RELEASE BUILDING BLOCK FB28
This function block resets the new start bit and releases the building block for the SPS-access. This
bit is to be given by the individual data handling blocks.
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