Siemens SIMATIC HMI TP 170A, Руководство по эксплуатации оборудования, Страница: 32 / 108

Operation of Screen Objects
5-2
TP 170A Equipment Manual
Release 12/99
5.1 Overview of Screen Objects
Table 5-1 Screen objects configurable for the TP 170A
Screen object Use/Description
Output field The output field displays the current value received
from the PLC in numeric or alphanumeric form.
Input field The input field is used to enter values which are then
transferred to the PLC. The characters 0..9 and A..F
are available for input. Entries which lie outside the
specified value range are rejected according to the limit
values which have been configured.
Input fields can be password protected. Notes on input
are provided on Page 4-4.
Text Text is used during configuration to label operating and
display elements, for example. Text can be configured
over several lines and cannot be altered on the
operating unit.
Graphics Graphics can be used in the configuration, e.g. to
represent a system or as an illustrative symbol for
configured display and operating elements.
Status button A Status button is a display and input element with two
different statuses.
Notes on the Status buttons is provided on Page 5-3.
Bar Bars represent values from the PLC as rectangular
areas. The operating unit thus provides a clear
indication of how far the current value is from the limit
values, or if a setpoint value has been reached, at a
glance. Bars are often used to represent fill levels or
workpiece numbers.
Direction, scaling and labeling the axis can be
configured as required. In order to identify limit values,
limit value lines can be called in.
Message view Special filter criteria for displaying pending messages
are configured in the message view.
Notes on operation are provided on Page 5-6.
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