Chapter 3
MMS and Your Coprocessor
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DeleteNamedType
MMS security acts as a ‘‘master switch” you set either ON or OFF through
the MAP Station Manager. With it, you can choose to either give remote
applications the access to these 16 services (maximum privilege) or no
access to these services (minimum privilege).
When MMS security is
set to:
Then:
OFF (disabled)
MMS security is
off
and all remote MMS
applications have access to the 16 services (in
addition to all other MMS services).
ON (enabled)
MMS security is
on
and only MMS applications
with security level 1 have access to the 16
services (in addition to all other MMS
services).
The Allen–Bradley default setting for MMS Security is OFF.
There is a field in each remote application’s LDIB entry that indicates the
level of security for that application. The security field is where you
assign the remote application one of the two security levels:
If you assign a
remote application:
Then, when MMS security is ON, that remote MMS
application has:
security level 0
minimum privilege, and therefore has no access to
the 16 MMS services.
security level 1
maximum privilege, and therefore has access to the
16 MMS services.
Note that the security field is only relevant when MMS security is ON,
when security is OFF, the field is meaningless.
Important: When MMS security is ON, all remote applications
connecting to the OSI coprocessor will be given minimum security by
default. Maximum security will be given to only remote applications that
meet the following criteria:
you have an LDIB entry for that remote application
the LDIB security field is equal to 1 for that remote application
you have an AP title and AE qualifier entry in the LDIB for that remote
application
the AP title and AE qualifier information sent from that remote
application matches what is in the LDIB for that remote application
The MMS security mechanism does not affect the ability of remote MMS
applications to connect (establish an association) to the OSI coprocessor,
only the services supported on that connection.
Содержание PLC-5 MAP/OSI
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Страница 91: ...Mapping MMS Data Types onto PLC 5 40 5 60 File Types Appendix A A 2 T ACC D 16 AB Parts...