Rockwell-automation 1747-PCIS API Software - Open Controller Manuel d'utilisateur télécharger pdf (Page 18)

Publication 1747-UM002A-US-P - June 2000

1-6 Overview

In addition to providing access to the control scanner, the dual port

memory also provides non-volatile (optional battery-backed) storage

for:

• I/O values

• application parameters (timers, counters, presets)

Scanner Modes

In both application types, the scanner CPU operates in six

basic modes:

• performing POST (power-on self test)

• waiting for host initialization

• Idle

• Scan

• Faulted

• non-recoverable fault

After the scanner successfully completes the POST, the scanner waits

for an initialization complete command from the application. Once the

scanner receives this command, the scanner enters Idle mode.

Before the scanner can enter Scan mode, the application must

download a valid I/O configuration to the scanner.

If a recoverable fault occurs, the scanner enters Faulted mode. Use the

OC_ClearFault API function to clear the fault before the scanner can

resume operating in Scan mode.

If a non-recoverable fault occurs, reset the scanner (cycle power).

Some possible non-recoverable faults include:

• POST failure

• background diagnostic failure

• internal watchdog timeout

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Rockwell-automation 1747-PCIS API Software - Open Controller Manuel d'utilisateur Page 18