Chapter 3
MMS and Your Coprocessor
3-22
AB_PLC5_LAST_EDIT_TIME: this named variable is of type
generalized time and indicates the last time the user program was edited.
This is a time ‘‘marker” that is updated when you:
- clear the PLC–5 controller’s memory
- insert or remove instructions
- create or delete program files
- perform set or reset test edits
- perform assemble edits
You can read this variable using MMS services, but you cannot write it.
AB_PLC5_PROG_CHECKSUM: This named variable is a 16–bit
signed integer and indicates the checksum of the PLC–5 controller user
program. This is continuously updated by the PLC–5 controller as the
program changes. You can read this variable using MMS services, but
you cannot write it. This variable is the same as S:57 in the PLC–5
controller.
M_DAYTIME: this named variable indicated the time of day and is of
type generalized time. This variable provides direct access to the
‘‘real–time clock” in the status section of the OSI coprocessor. You can
read and write this variable using MMS services.
Note that these MMS variables are defined automatically when your
coprocessor is powered up and therefore you are not able to erase them
from memory.
The OSI coprocessor has a security mechanism that allows you to restrict
the access that remote applications have to the following MMS services:
Rename
InitiateDownloadSequence
DeleteDomain
CreateProgramInvocation
DeleteProgramInvocation
Start
Stop
Resume
Reset
Write
DefineNamedVariable
DeleteVariableAccess
DefineNamedVariableList
DeleteNamedVariableList
DefineNamedType
MMS Security
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...