Siemens SIMATIC HMI KTP700F Mobile HW Información Del Producto página 18

Direct keys
Direct keys on the HMI device set bits directly in the I/O area of a SIMATIC S7 controller. A direct key enables operation with
a short response time, for example, as required for setup mode.
Read "Evaluating operator controls as direct keys (Page 19)".
Note
You can only use direct keys when there is a connection over PROFINET IO.
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The direct key function is available or active from the following time:
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– Key switches, illuminated pushbutton and corresponding LEDs:
As soon as the HMI device is supplied with power.
– Function keys with direct key functionality and corresponding LEDs:
As soon as a corresponding project is started on the HMI device.
Direct keys are still active when the HMI device is in "offline" mode.
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If you operate a function key with direct key functionality when a project is running, the direct key function is always
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executed, regardless of the current display content.
Evaluation of the operator controls
Overview
The following information can be transferred between the HMI device and the PLC:
● Direction pulses of the handwheel
● State of the function keys
● State of the keyswitch
● State of the illuminated pushbuttons
● State of the LEDs of function keys and illuminated pushbuttons
● Override rotary switch (only for device version with Override)
Note
The state of function keys and associated LEDs is transmitted as soon as a relevant project is started on the HMI device.
The states of the following operator controls are transmitted as soon as the HMI device is connected to a connection box:
Handwheel (direction pulses)
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Keyswitch
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Override rotary switch
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Illuminated pushbutton with associated LEDs
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There are two ways of transmitting information:
● Direct keys
These are described in section "Evaluating operator controls as direct keys (Page 19)".
● System functions of WinCC
These are described in section "Controlling the LEDs of the function keys by means of system functions (Page 23)".
Note
The following sections are intended for the configuration engineer.
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KTP700F Mobile HW, KTP700F Mobile HW/OR
A5E44033674-AA, 08/2018