Apparatus for the fail-safe display of an indicating diagram

Details Apparatus for the fail-safe display of an indicating diagram Apparatus for the fail-safe display of an indicating diagram

G - Physics

09

G

375/5

G09G 5/00 (2006.01) G06F 11/16 (2006.01) G06F 11/00 (2006.01)

Patent

CA 2036013

Abstract Apparatus for the Fail-Safe Display of an Indicating Diagram An apparatus for the fail-safe display of an indicating diagram is disclosed which allows the use of high- resolution screens (HB) with individually addressable dots and eliminates the need to derive a check code from the serial picture-data stream, which derivation poses problems at very high refresh memory readout fre- quencies. To generate the check code, the picture data which are transferred into the refresh memory (BW1) are transferred in parallel into an additional, like memory (BW2) which is not followed by a screen, and read immediately thereafter from the additional memory into a check-code generator (P). In a control computer (SR) calling for the indicating-diagram display, a check code generated by the check-code generator is compared with a previously stored reference code. If the two codes do not match, an error indication is initiated. Figure K. Pierick et al 1-1-2-2

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