HEIDENHAIN TNC 335 Technical Manual - Manual (Page 246)

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TNC 360 8 Key Simulation 4-149
8.2 Machine control panel
A manufacturer's specific machine control panel can be connected to the HEIDENHAIN contouring
controls. See Chapter "Mounting and electrical installation".
24 PLC inputs (I 128 to I 151) and 8 PLC outputs (O 0 to O 7) are available on the female connector
X27 for the evaluation of the keys on the machine control panel. The evaluation of the signals from
the machine control panel must be performed in the PLC program. The appropriate markers will be
set thereby. For safety reasons a complement marker must be reset when some functions are
activated. This is especially so for keys with several contacts. If the complement marker is not
properly set or reset, the flashing error message "Error in PLC program" will appear. The displayed
code identifies the marker where the error has occurred.
An axis direction key which has been operated can be stored by marker M2450 (Complement
marker M2466) . This means that the axis will be traversed until NC STOP occurs. This memory
function must be activated by machine parameter MP7680 Bit 0.
MP7680 - Memory function for axis-direction keys, memory function for
Input: 0 or 1
+ 0 = Not stored
+ 1 = Stored
Marker Function Error
message Set Reset
M2448 NC start (edge evaluation) 1A PLC PLC
M2464 Complement NC start
M2449 Rapid traverse 1B
M2465 Complement – rapid traverse
M2488 NC stop (“0” signifies stop) –
M2450 Memory function for axis-direction keys 1C
M2466 Complement – memory function for axis-
direction keys
M2451 Feed release for all axes 1D
M2467 Complement – feed release
M2456 Manual traverse X+ 1I
M2472 Complement - manual traverse X+
M2457 Manual traverse X- 1J
M2473 Complement - manual traverse X-
M2458 Manual traverse Y+ 1K
M2474 Complement - manual traverse Y+
M2459 Manual traverse Y- 1L
M2475 Complement - manual traverse Y-