3. I/O Highway
GEM80-400
Page 3-2
ALSPA GEM80-400 SERIES CONTROLLER TECHNICAL MANUAL
Issue 3 04/99
IN THE EVENT OF F-TABLES BEING SET, THE ASSOCIATED INPUTS DROP TO ZERO AND
THE ASSOCIATED OUTPUTS FREEZE. IT IS THE USER'S RESPONSIBILITY TO TAKE ANY
NECESSARY ACTION WITHIN THE PROGRAM TO ENSURE SAFE PLANT OPERATION
UNDER THESE CONDITIONS.
If failures are detected when critical inputs or outputs are being addressed (see
Chapter 9 of this manual for details of fault finding), the user program could use
F-table bits to trip the controller watchdogs by setting F1 to any non-zero value.
The Verification I/O Highway provides greater security against the transfer of
corrupted data between the controller and the GEM
80 I/O Modules. The
Verification I/O transfer provides 'address/data checkwords' and 'data confirm
words' during the I/O transfer. Outputs are not written to the plant by the I/O
module unless the address/data checkword sent by the controller is
mathematically verified. Inputs are not written into the A-tables unless the
checkword received by the controller is correct. If the data is not successfully
transferred after two retries, an F-table is set for that address and the value read
or written remains at the last value transferred correctly.
The F-table bits for Verification I/O are at F202 to F2xx; there are 2 bits per
address. The odd numbered bit indicates warning, this results in patterns such as
@5555; the even numbered bit indicates fault/fail.
3.3.
Typical I/O System
Figure 3.1 shows a typical I/O system using Basic I/O, Verification I/O and
Verification I/O converted to Basic I/O using 8191 expanders.
Figure 3.1 - Typical I/O System
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