Rockwell-automation 57C435 Processor Module, AutoMax Bedienungsanleitung PDF herunterladen (Seite 13)

2Ć3

The faceplate contains two green status lights and two

sevenĆsegment LEDs used for diagnostic purposes. The upper status

light, labeled BAT. OK", indicates whether the onĆboard battery is

providing sufficient voltage to retain the contents of RAM (ON) or

should be replaced (OFF). See 3.4 for directions on replacing the

battery and Appendix A for battery specifications. The lower status

light, labeled OK", indicates whether the board is operational (ON)

or should be replaced (OFF).

Five preĆassigned variables are available for use in all application

tasks to test the status of the onĆboard battery. These common

boolean variables will have the value 1 if the battery is functional and

0 if the battery is not functional. The variables are named according

to the Processor whose battery is being tested. BATTERYSTATUS0@

is used for the Processor in slot 0. BATTERYSTATUS1@ is used for

the Processor in slot 1, etc. up to slot 4.

See 3.5.1 and 3.5.2 for more information about the two

sevenĆsegment LEDs on the Processor.

2.2 Electrical Description

The Processor module contains a local watchdog timer which must

be reset within a specified interval or the Processor will shut down

and all I/O modules will be reset (initialized to 0, FALSE, or OFF).

Byte parity is supported for all backplane address and data lines.

The superĆcapacitor on the Processor module can be charged to

more than 90% of its rated capacity in approximately 15 minutes and

is typically capable of retaining the contents of RAM memory for

approximately 10 hours should the BAT. OK" light go out and power

is removed from the Processor.

The Processor serial ports support full modem control. RSĆ232C

signals have 450V isolation to logic common. Refer to figure 2.1 for a

typical circuit diagram.

+5V

OPTO ISOLATOR

GND

OPTO ISOLATOR

XMIT

RECV

Figure 2.2 Ć Typical RSĆ232C Circuit

Refer to 4.2 for more information on the characteristics of the

Processor ports available to the user through application tasks.

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Rockwell-automation 57C435 Processor Module, AutoMax Bedienungsanleitung Seite 13