Chapter 3
MMS and Your Coprocessor
3-20
remove the power and the battery from the OSI coprocessor, resulting in
the loss of non–volatile memory.
cause the auto clear function to clear non–volatile memory (see the
section titled Switch 3 in Chapter 2 for details of the auto clear
function).
For procedures on retaining MMS objects, refer to the Allen–Bradley MAP
Station Manager User’s Manual (publication 6630–6.5.2). For more
information on non–volatile memory, see the section titled Non–volatile
Memory and the Lithium Battery in Chapter 2.)
Saving MMS Objects to and Restoring Them From a File
You can save the MMS objects that are stored in non–volatile memory to a
DOS file in your Allen–Bradley MAP Station Manager directory. This is a
way of having a copy of your MMS objects, so that if they are lost, you
can re–load them to the OSI coprocessor.
When you restore the objects from the file, they are loaded to the OSI
coprocessor’s non–volatile memory (note, that you will overwrite any
existing information in non–volatile memory when you restore the
objects).
These procedures are called Save MMS Objects to a File and Restore MMS
Objects from a File. See the MAP Station Manager user manual for
instructions.
Important: When you restore MMS objects from a file, the OSI
coprocessor aborts all connections and resets itself after completing the
restoration.
MMS Named Variables That Always Exist in the OSI Coprocessor
Along with the MMS named variables that you define, your OSI
coprocessor also supports other named variables that are pre–defined and
always exist. These are automatically created when you power–up the OSI
coprocessor and exist as long as the OSI coprocessor is in fully
operational mode (you cannot delete them). The variables are listed
below:
AB_O5_BATTERY_LOW: this named variable is of type boolean and
indicates whether or not the battery has sufficient power to retain
non–volatile memory if power is removed from the OSI coprocessor. If
the value of this variable is true, the battery power is not sufficient to
retain memory when power is removed from the OSI coprocessor. The
value will be false otherwise. You can read this variable using MMS
services, but you cannot write it.
AB_O5_SWITCH_SETTINGS: This named variable is of type bit
string and indicates the values of the coprocessor’s switch settings. The
Summary of Contents for PLC-5 MAP/OSI
Page 1: ...PLC 5 MAP OSI Software User Manual Cat No 1785 OSI AB Parts...
Page 4: ...Table of Contents iii OSI Layer Management E 1...
Page 57: ...Chapter 4 Basic Programming Techniques 4 7 For example B7 6 10 AB Parts...
Page 91: ...Mapping MMS Data Types onto PLC 5 40 5 60 File Types Appendix A A 2 T ACC D 16 AB Parts...