Siemens SIMATIC S5 Manual page 290
Distributed i/o system
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How does token
Fig. C-10 illustrates how the token is passed from one master to another. The
passing work?
same principle applies for any multimaster configuration.
Master No. 1 has the token and
thus can address its slaves.
Master No. 2 cannot access its
slaves.
Master No. 1 passes the token to
master No. 2. At this point neither
master can access its slaves.
Master No. 2 has the token and
thus can address its slaves.
Master No. 1 cannot access its
slaves.
Master No. 2 passes the token to
master No. 1. At this point neither
master can access its slaves.
Steps
to
are repeated again and again.
Figure C-10 Token passing between two masters
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Reaction times in the ET 200 distributed I/O system
Token
Master No. 1
AG
Slave
Slave
Token
Master No. 1
AG
Slave
Slave
Master No. 1
AG
Slave
Slave
Token
Master No. 1
AG
Slave
Slave
Master No. 2
AG
Slave
Slave
Master No. 2
AG
Slave
Slave
Token
Master No. 2
AG
Slave
Slave
Master No. 2
AG
Slave
Slave
C-23
C
- Quick Links:
- IM 308-C Master Interface
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