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Standard Mode
Section 4-4
4.4.2
External Mask Selection
Mask calls from the controller are handled in the same way as messages. This
requires simply that 8000H is added to the desired mask number prior to transfer.
When the same number is assigned to a mask and message, both the mask and
the message are called up during external mask selections.
This effect can be used to provide help in a mask. Otherwise, ensure that different
numbers are used for masks and messages.
A mask called up externally is considered selected once the desired mask number
appears in the variable
,
Image of Mask Number
.
. The acknowledgement from
the serial message channel is not a reliable confirmation of the mask output.
Example 1: Mask number and message number are not identical
A project comprises masks with numbers ranging from 100 to 200; the first mes-
sage has the number 10.
Mask 118 is to be called up by the controller.
The following adding operation must be performed in the controller:
118 + 8000H = 76H + 8000H = 8076H.
The value 8076H must be written to the address of the serial message channel.
Only mask 118 is displayed.
Example 2: Mask number and message number are identical
A project comprises masks with numbers ranging from 1 to 100; the first message
has the number 10.
Mask 50 and serial message 50 are to be called up by the controller.
The following adding operation must be performed in the controller:
50 + 8000H = 32H + 8000H = 8032H.
The value 8032H must be written to the address of the serial message channel.
Both the mask 50 is displayed and message 50 are written to the message buffer.
4.4.3
Password Protection, Access Authorization
The operating concept incorporates a password protection function. Password
protection prevents masks from being accessed and the data they contain from
being altered without proper authorization. The protective function is available in
every operating terminal. It is obtained by assigning access levels to masks and by
using passwords.
Unless otherwise specified by the programmer, the access levels of all masks auto-
matically default to the lowest level (=0), i.e. no password is required to access all
masks with this access level.
Two authorization levels, referred to as the edit level and the view level, are as-
signed to every password.
View level means that the next mask can be viewed after entering the password but
the values in it can also not be edited.
Edit level means that the mask can be viewed after entering the password and the
values in it can be edited.
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Страница 3: ...iii NT4S NT15S NT18S Programmable Terminal Operation Manual Produced March 1999 ...
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Страница 26: ...12 The Terminals of the NT Series Section 1 2 1 2 4 1 2 NT4S SF122B E 1 2 4 1 3 NT4S SF123B E ...
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Страница 37: ...23 The Terminals of the NT Series Section 1 4 1 4 1 3 NT4S SF123B E 1 4 1 4 NT15S SF121B E ...
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Страница 232: ...Authorized Distributor Cat No V056 E1 1 Note Specifications subject to change without notice Printed in the Netherlands ...