Omron NT15S, Руководство по эксплуатации

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70
Standard Mode
Section 4-5
4.5 Masks
In conjunction with the operating system, the term ‘mask’ always refers to the con-
tents of one screen. The size of masks therefore varies from operating terminal to
operating terminal.
Masks with a specific functionality form the basic elements of the operator guid-
ance. The first step when programming a mask is to specify its functionality. The
process of designing the operator guidance is greatly simplified by the restricted
number of different mask types.
The following mask types are available in the operating concept:
-
Setup Mask (system mask)
- Start Mask (system mask)
- Password Mask (system mask)
- Main Mask (system mask)
- I/O Mask (user mask)
4.5.1 Mask Parameters
The number of mask parameters that is available for a specific mask depends on
the mask type. The mask parameters determine the functionality of the control keys
in the operator guidance. Any mask parameters which are not required may remain
unassigned. If no mask parameters at all are programmed, only the function keys
or external mask selection can be used to exit the mask in question.
The functionality of the control keys specified in the mask parameters is subject to
access control of the password system. This prevents unauthorized access to
masks via the control keys.
In addition to the control key functionality, the mask parameters also contain the
access level definition. The access level indicates the minimum value that a pass-
word (view level, edit level) must have to be authorized to access a mask and edit
its values. The default value used for the access level is ‘0’ (meaning free access).
A selected Automatic Data Release option in the mask parameters will allow the
operator to supply input into the mask without having to press the Data Release key
first.
An option for automatic reactivation of the password protection is also available in
the mask parameters to ensure that the password has to be reentered when a
password-protected mask is called up again.
4.5.2 System Masks
System masks facilitate initial programming. They also get your system up and
running directly. This makes the initialization phase an integral part of the user
description. Any mask can be selected as a system mask. System masks are basi-
cally I/O type masks with a few restrictions. These restrictions result from the op-
erator-prompted initialization phase and the fact that communication to the con-
troller is not yet established.
The system masks Setup Mask and Start Mask can not be accessed via external
mask selection!