Beckhoff C1300 Manual do Utilizador descarregar pdf (Página 38)

C1300 VME to II/O Interface Unit Beckhoff II/O-System

Page 38 of 44 Version : 2.01 Date : 18.12.95

3.5. Signal state control functions

The General Control Block is used for controlling the refresh of a single signal state. It will be

refreshed and, through the ready mask, reported ready by setting the corresponding bit in the

call mask. After it was reported ready the bit must be cleared from the call mask, only then

communications can be started again. The refresh of signal states can be interrupted. When

there is a refresh in process and if there is a refresh of a higher priority called in the call mask,

the process is interrupted.

In case errors are detected in the fo-ring in a normal system run, the corresponding bits in the

error mask are set.

Address

(hex)

Contents Comment

0FFF call mask

0FFE IRQ-output

0FFD ready mask

0FFC IRQ-input

0FFB write protection

The value 02

removes the write

protection

0FFA error mask

0FF9 -

reserved for later use

... -

- " -

0FF1 VMEbus Interrupt

Vector

Vector numbers 0h-FFh for D08

interrupter

0FF0 VMEbus Interrupt

Level

2h = IRQ1,4=IRQ2 80h=IRQ7

mask register

General Control Block

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 44

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Beckhoff C1300 Manual do Utilizador Página 38