Three-input poller

Details Three-input poller Three-input poller

1992-07-23

1995-05-09

Beausoliel, Jr., Robert W.

Excavating

326 35, 326 11, G06F 1108

Patent

active

054147182

ABSTRACT:
A poller including an output (S), as well as a first (E1), a second (E2), and a third (E3) input, receiving respectively a first (E.sub.s 1), a second (E.sub.s 2), and a third (E.sub.s 3) signal, which are identical during normal operation. The poller further includes a two-channel diverter (AIG1) provided with an active input (A), a quiescent input (R), a control input (EC) and a common output (SC). The quiescent input (R) and the active input (A) of the diverter (AIG1) are respectively connected to the first (E1) and second (E2) inputs of the poller, whereas the common output (S) of the diverter (AIG1) is connected to the output (S) of the poller. A first monitor (M1) with two inputs (X, Y), branched between the second and third inputs (E2, E3) of the poller, is used to measure the deviation between the second (E.sub.s 2) and third (E.sub.s 3) signals and to control the diverter (AIG1).

REFERENCES:
patent: 3555290 (1971-01-01), Ellermeyer
patent: 3725818 (1973-04-01), Nurmohamed et al.
patent: 4264955 (1981-04-01), Goodwin
patent: 4593249 (1986-06-01), Aeita et al.
patent: 4617475 (1986-10-01), Reinschmidt
patent: 4726026 (1988-02-01), Hilford et al.
patent: 4748594 (1988-05-01), Iida
patent: 4862297 (1989-08-01), Fukami et al.
ISA Transactions, vol. 29, No. 2, 1 Feb. 1990, pp. 13-16, A. A. Frederickson, "Fault tolerant programmable controllers for safety systems".

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