
Chapter 2
The PLC-5 802.4 MAP/OSI Coprocessor
2-8
Figure 2.6
A Description of Each OSI Coprocessor Switch
1
2
3
4
Allows you to select the default mode of operation the
coprocessor enters on power-up or reset.
Fully Operational/Partially Operational Switch
When this switch is:
partially operational mode.
Then the coprocessor:
If you select:
The coprocessor powers
up in:
fully operational mode.
enters fully operation
mode.
enters partially
operational mode.
enters partially
operational mode.
fully operational mode
and there is a valid image
in non-volatile memory
fully operational mode
and there is not a valid
image in non-volatile
memory
partially operational
mode.
Allows you to select the values the coprocessor uses for the MAC layer and
RS-232 port parameters on power-up or reset.
User/Allen–Bradley Communication Defaults Switch
When this
switch is:
The coprocessor powers
up using:
Allen-Bradley
communication default
settings.
user communication default
settings. If no user defaults are
stored, Allen-Bradley
communication defaults are
used.
These settings are the values:
used for the MAC layer and RS-232
port configuration parameters
whenever the coprocessor's
non-volatile memory is reinitialized.
of the MAC layer and RS-232 port
parameters when you edit them via
the Allen-Bradley MAP Station
Manager. The coprocessor uses
these values in place of the
Allen-Bradley communication
defaults (unless this switch is set to
ON).
Allows you to specify whether or not the contents of non-volatile memory will be erased (cleared) when the coprocessor is detached from the PLC-5 controller,
and reattached to a different controller.
Auto Clear Switch
When this
switch is:
Then:
the auto clear function is disabled and you are free to
interchange coprocessors and PLC-5 controllers at anytime
WITHOUT losing the contents of non-volatile memory.
the autoclear function is enabled. The contents of non-volatile
memory will be erased if and only if you complete all of the
following tasks:
1.
Unmate the coprocessor and PLC-5 controller.
2.
Reattach the coprocessor to a different PLC-5 controller.
3.
Install the new mated pair into a chassis and apply power.
4.
Place the coprocessor into fully operational mode.
Why Use the Auto Clear Switch?
Typically, a maintenance engineer can swap a non-functioning
OSI coprocessor with another. A coprocessor, initially mated to a
PLC-5 controller, could later be mated to another. Since the
configuration information follows the OSI coprocessor, that
information may be incorrect for the new PLC-5 controller
location.
It is possible, for example, that some of the MMS named variables
in the first application would match those in the second application
in name, but not in content or meaning. This is a situation where
you may decide to ENABLE the auto clear switch, allowing you to
clear the contents of the coprocessor's non-volatile memory,
even with the coprocessor mated to a new PLC-5 controller.
(Switch 1)
(Switch 2)
(Switch 3)
(Switch 4)
Important:
Keep this switch
OFF. This should be turned on by
authorized Allen-Bradley
personnel only.
ON
OFF
ON
OFF
ON
OFF
OFF
I - 12419
Содержание PLC-5 MAP/OSI
Страница 1: ...PLC 5 MAP OSI Software User Manual Cat No 1785 OSI AB Parts...
Страница 4: ...Table of Contents iii OSI Layer Management E 1...
Страница 57: ...Chapter 4 Basic Programming Techniques 4 7 For example B7 6 10 AB Parts...
Страница 91: ...Mapping MMS Data Types onto PLC 5 40 5 60 File Types Appendix A A 2 T ACC D 16 AB Parts...