Setting An Operating Mode - Siemens simatic hmi op27 Equipment Manual

11.1

Setting an Operating Mode

The OP27 can only be used in OP mode, whereas the OP37 can also be used
in DOS mode.
OP mode
In OP mode, the entire functionality of the OP is available for operating and
monitoring a system or process. It consists of the following modes
S
S
S
S
Online
This is the standard operating mode for unrestricted process operation and pro-
cess visualization. In Online mode, there is a logical connection between the
OP and the PLC, or the OP attempts to establish one.
Offline
In Offline mode, there is no logical connection between the OP and PLC. The
OP does not attempt to establish a connection. The OP can still be operated.
Process control and process visualization are not possible.
Download In Download mode, data can be downloaded from the configuration computer
to the OP (refer to Chapter 14.2). In this mode, there is no logical connection
between the PLC and the OP. The OP cannot be operated in Download mode.
S
Changing the
operating mode
S
DOS mode The OP37 can also be used for applications which run under DOS or Windows.
The points which need to be taken into account in DOS mode, and the proce-
dure for changing from OP to DOS mode, are described in Chapter 15.
OP27, OP37 Equipment Manual
Release 05/99
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Online
Offline
Serial Download
MPI Download (S7),
In routine operation
Position the cursor on the System Settings standard screen at the Mode sym-
bolic input field and select the mode required from the selection box. The
OP saves the current operating mode in a non-volatile memory. When sub-
sequently powered up, the OP automatically reactivates the most recent
operating mode.
During the startup phase of the OP
The procedure for setting the OP to Download mode in the startup phase is
described in Section 14.2
System Settings
11-3