Rockwell-automation 57C423 Common Memory Module Manual de usuario descargar pdf (Pagina 38)

FĆ2

Appendix F

(Continued)

The Common Memory Module Is In Any

Even Slot Other Than 0

In the following, assume the Common Memory module is in slot 2 and the single

Processor module in the rack is in slot 1. Recall that in this configuration, common

variables, as well as local variables, are being stored on the Processor module.

Status of Data

Common

Action

App.

Ta sk

Deleted?

App.

Ta sk

Status

NonVol Vol I/O Local

Replace 57C413A with

Same or new 57C413A

ąAt power up

NO STOP Data OK Zero Lost

(Random)

Data OK

Replace 57C413A with

New 57C413B or

57C423

ąAt power up

NO STOP Data OK Zero Zero* Data OK

Replace 57C413A with

used 57C413B or

57C423 (module may

contain data from

another application)

ąAt power up

NO STOP Data OK Zero Value from

programmed

module at

same

address*

Data OK

Replace 57C413B or

57C423 with New

57C413B

ąAt power up

NO STOP Data OK Zero Zero* Data OK

Replace 57C413B or

57C423 with used

57C413B or 57C423

(module may contain

data from another

application)

ąAt power up

NO STOP Data OK Zero

Value from

used module

at same

address*

Data OK

Replace battery on

57C413B or 57C423 and

return same module to

rack

ąAt power up***

NO STOP Data OK Zero Data OK Data OK

* To ensure your application task does not access old or incorrect data, create

a BASIC task to write zeroes to each register location before you run any

other application tasks.

** Assumes superĆcapacitor has maintained memory on the module during the

time required to replace the battery.

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