Setting Op Modes - Siemens OP7 Equipment Manual

10.4

Setting OP Modes

Modes You can set the following OP modes by means of standard screens:
Online
This the default operating mode for unrestricted control and visualization of
the process. In Online mode, there is a logical link between the OP and the
PLC, or the OP tries to establish a link.
Offline
In Offline mode, a logical link does not exist between the OP and the PLC.
The OP does not even attempt to establish a link. You can still operate the
OP. It is not possible to control and visualize the process.
Download In Download mode, data can be downloaded from the configuration com-
puter to the OP. There is no logical link between the PLC and the OP in this
mode. You are not able to operate the OP in download mode.
Loop-Through with
While the OP is being commissioned, troubleshooting or optimization of the
OP17 PLC program is often necessary. For this purpose, the PU or PC can be con-
nected to the second interface of the OP17 in Loop-Through mode. This way
it is possible to communicate between PC/PU and the PLC through the OP17.
For the restrictions which have to be taken into account in Loop-Through
mode refer to section 14.2.4.
Jobs from the PLC to the OP17 can be initiated only when the OP17 is either
working in online mode or has been switched to loop-through mode.
Setting the OP
To set OP modes, proceed as follows:
mode on standard
screens
You will find further information on OP modes in chapter 15 of this manual.
Equipment Manual OP7, OP17
Release 04/99
Online,
Offline,
Download and
Loop-Through (OP17 only).
Step
1 Choose the standard screen System settings
2 Set the mode you require by means of a symbolic input.
3 Exit from the standard screen by pressing
Procedure
OpMode.
ESC
10-5