Communication System Manual 3WN6 Circuit-Breakers
64 Copyright Siemens AG 1998. All rights reserved. Version 1.0 (02/98)
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:
Contents and function of data blocks:
DB80 DB header, assignment of parameter identifier for message group 0
DB81 DB header, assignment of parameter identifier for message group 1
DB210 (DBG0) Storage locations for read circuit-breaker data
DB220 (DBG1) Storage locations for read operational data of circuit-breaker (actual values!)
DB230 (DBSZ) Storage locations for operational data to be sent to the circuit-breaker
DB240 (DBAT) Storage locations for T-Nr. enable, priority assignment and request coordination
- old values which have already been written to the circuit-breaker
FB81
FB82
FB10
OB1
FB100
FB101
FB102
DB80
DB81
DB210
DB220
DB230
DB240
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