Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Pobierz pdf (Strona 17)

Publication 1747-UM002A-US-P - June 2000

Overview 1-5

Common Attributes of the 1746 I/O PCI Interface and 1747 Open

Controller Architectures

The functionality described in the rest of this chapter is shared by

both architectures, 1746 I/O PCI Interface and 1747 Open Controller.

The dual port is an 8K byte memory partition (optionally

battery-backed) that provides an interface between the integrated

scanner and your application software that resides on the host.

Your application (the code you develop using the API) uses the dual

port memory to communicate with the scanner to handle control

functions on the 1746 backplane, such as:

• scanner commands and responses

• battery and scanner status

• scan rate frequency and timing

• I/O image counters

• priority messages and interrupts

• semaphores to ensure data integrity

• software-generated watchdogs

• control of the 4 user-definable LEDs, the 2-position jumper, and

the 3-position switch

The scanner functionality of the dual port supports I/O control

functions, such as:

• synchronizing scans to the application

• forcing I/O

• defining discrete-input interrupts

• defining I/O module-driven interrupts (such as for the 1746-BAS

module)

• enabling and disabling I/O slots

• resetting I/O

IMPORTANT

On the 1747-PCIS only, the jumper for the

battery-backup dual-port memory is disabled by

default. You must switch the jumper to enable the

battery-backup feature.

The 1747-OCF dual port is NOT battery-backed.

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Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Strona 17