Keystroke Simulation - HEIDENHAIN TNC 426 PB/M Technical Manual

6.14 Keystroke Simulation

6.14.1 TNC Keyboard Unit
6 – 338
HEIDENHAIN contouring controls have two control panels:
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TNC keyboard unit
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The machine operating panel from the machine tool builder
The control panels are connected with the logic unit at connections X45 and
X46.
The key code of the TNC keyboard unit is evaluated directly by the NC.
PLC inputs and outputs for the machine control panel are available on
connector X46. The PLC must evaluate these PLC inputs and outputs and set
the appropriate markers.
The key code of the TNC keyboard unit is evaluated by the NC. The key code
is displayed in W274 while a key is being pressed. (See "Codes for keystroke
simulation" on page 6 – 342).
If you press a disabled key, marker M4577 is also set.
The following modules can influence keys and soft keys:
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Module 9180: Simulation of NC keys
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Module 9181: Disabling of individual keys
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Module 9182: Re-enabling of individual keys
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Module 9183: Disabling groups of NC keys
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Module 9184: Re-enabling of groups of NC keys
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Module 9186: Calling a soft-key function
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Module 9187: Status of a soft-key function call
With MP4020 bit 9, specify whether a simulated key should only be
transmitted to the NC, or also to an active PLC window.
With MP4020 bit 10, specify whether a disabled key should be disabled only
for the active PLC window, or for the active PLC window and for the NC.
W274 Code of the depressed key
M4577 Disabled key was pressed
MP4020 PLC compatibility
Input: Bit 9 – Behavior of a simulated key
0: Simulated key is transferred immediately to the NC
1: Simulated key is processed first by an active PLC window
before being transferred to the NC
Bit 10 – Behavior of a disabled key
0: Locked key only works on the active PLC window
1: Locked key works on neither the active PLC window nor on
the NC
HEIDENHAIN Technical Manual TNC 426, TNC 430
Set Reset
NC NC
NC PLC