HEIDENHAIN TNC 306 Technical Manual - Manual (Page 210)

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TNC 406/TNC 306 8 Key simulation 2/97
8.2 Machine control panel
A manufacturer's specific machine control panel can be connected to the HEIDENHAIN contouring
controls. See "Mounting and Electrical Installation."
There are 24 PLC inputs (I128 to I151) and 8 PLC outputs (O 0 to O 7) 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. 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 pressed can be stored by marker M2450 (Complement-marker
M2466) . This means that the axis will be traversed until the marker M2450 is reset. This memory
function must be activated by machine parameter MP7680 Bit 9.
MP7680 Memory function for axis-direction keys
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 enable 1D
M2467 Complement – feed enable
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–