Technical data

6-8 Bosch Rexroth AG | Electric Drives and Controls Rexroth VCP-Operating Concept | R911305038 / 01
3964 RK512
If you specified a coordination flag in the protocol parameters, this flag
is set in the passive partner upon receipt of data. After processing the
received data, the coordination flag is reset.
If the passive partner's coordination flag is set when it receives data,
then the passive partner sends a response telegram to the active part-
ner thereby indicating this as an error.
Restrictions of the 3964R Protocol
With the 3964R protocol, a maximum of 128 bytes of data can be trans-
mitted per telegram. No continuation telegrams are transmitted or pro-
cessed.
6.1.2 Data Types
Direct access is possible to the following data types.
The size of each data area depends on the CPU of the PLC.
Flag Byte MB 3 n Bytes Offset
Flag Word MW 3 n Bytes Offset
Flag Double-Word MD 3 n Bytes Offset
Data-Word Left (High) DL 26 1 Byte DB DW
Data-Word Right (Low) DR 27 1 Byte DB DW
Timer T 20 n Bytes Offset
Counter Z 21 n Bytes Offset
Data Type Mnemonics Byte 1
(Com-
mand)
Byte 2
(Num-
ber)
Byte 3 Byte 4
Fig. 6-8: Specifying the destination information for a write-access via a data block
Type Mnemonics Access
Input Bit E Bit Access (Read Access Only)
Input Byte EB Byte Access (Read Access Only)
Input Word EW Word Access (Read Access Only)
Input Double-Word ED Double-Word Access (Read Access Only)
Output Bit A Bit Access
Output Byte AB Byte Access
Output Word AW Word Access
Output Double-Word AD Double-Word Access
Fig. 6-9: 3964 RK512 data types