Siemens 3VF Series Communications Manual page 64

Communication System Manual
The FBs SEND and REC are assigned to data blocks when they are called. DB80 contains the
message headers for message group 0 and DB81 contains the message headers for message group 1.
These blocks are structured such that the basic data word (DW no.) can be calculated as follows for a
message number (T-Nr.):
DW no. = 2 x T-Nr.
The parameter identifier is stored in the basic data word. The following data word contains the
parameter subindex.
The data to be sent and the data to be received (to/from 3WN6) are also stored in data blocks (in the
example: DB230 and DB220).
Block call structure of example:
OB1
Contents and function of data blocks:
DB80
DB81
DB210 (DBG0)
DB220 (DBG1)
DB230 (DBSZ)
DB240 (DBAT)
64
FB10
DB header, assignment of parameter identifier for message group 0
DB header, assignment of parameter identifier for message group 1
Storage locations for read circuit-breaker data
Storage locations for read operational data of circuit-breaker (actual values!)
Storage locations for operational data to be sent to the circuit-breaker
Storage locations for T-Nr. enable, priority assignment and request coordination
- old values which have already been written to the circuit-breaker
© Copyright Siemens AG 1998. All rights reserved.
3WN6 Circuit-Breakers
FB81
DB80
DB81
FB82
DB210
FB100
DB220
FB101
DB230
FB102 DB240
Version 1.0 (02/98)