Rockwell-automation 47C626 AutoMax Programming Executive V4.2 Manuale Utente Scaricare il pdf (Pagina 149)

10Ć5

After the diagnostics are complete, a checksum of a portion of the

contents

of memory is verified against a checksum which was stored

in memory when a loss of AC power was detected. This determines

whether the system performs a reĆstart or a coldĆstart when power is

turned on. See 10.13 and 10.14 for more information on cold starts

and system reĆstarts.

10.9 RunĆTime Diagnostics

The Processor module performs realĆtime checking of all data paths

on the module by means of a parity test. The Processor contains a

memory

management unit (MMU) that prevents errors such as writing

to locations that are readĆonly.

Should a failure be detected, a fault code will be displayed and the

Processor shut down. See instruction manual JĆ3650 for more

information on runĆtime diagnostics.

10.10 Status Codes

Status

Codes are those codes

displayed on the sevenĆsegment LEDs

on the Processor module faceplate while the OK" indicator is on.

Status codes simply indicate that a particular operation is occurring

that a particular condition exists. They do not cause the Processor

to shut down. Status codes may or may not be cleared when the

condition they indicated no longer exists. See Appendix B for a list of

status codes.

10.11 ShutĆDown Faults

Serious hardware malfunctions that cause the Processor to shut

down and the OK" indicator to be turned off are called shutĆdown

faults. When possible, the cause of the shutĆdown is indicated by an

error code on the seven segment LEDs. See Appendix B for a list of

status and error codes.

Once a Processor module has shut down, it will not execute any

instructions or respond to commands from the personal computer

until it is reset by cycling power.

10.12 StopĆAll Faults

In AutoMax systems, both a StopĆAll command and a StopĆAll fault

have the same result. A StopĆAll command can be issued from the

online menu of the Programming Executive software. A StopĆAll fault

occurs when there is a serious error either in an application task in

the rack (e.g., invalid BASIC language EVENT statement), or when

there is a serious error in an AutoMax Processor or Universal Drive

Controller module. See Appendix B for a list of status and error

codes.

Both a StopĆAll fault and a StopĆAll command will result in all

application tasks in the rack being stopped. The common clock

signal

on the rack backplane (CCLK) will

also be disabled. A StopĆAll

fault will result in an error code display on the faceplate of the

AutoMax Processor that was running the task that caused the

StopĆAll. Neither the operating systems or the application tasks on

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Rockwell-automation 47C626 AutoMax Programming Executive V4.2 Manuale Utente Pagina 149

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