HEIDENHAIN TNC 335 Technical Manual - Manual (Page 297)

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TNC 360 15 Tool Changer 8/95
been physically changed. If the control is switched off and back on again in the above-mentioned
condition, the tool last inserted becomes active again.
The number of tools with a pocket number is defined in machine parameter MP7261. The input
value for MP7261 matches the number of pockets in the tool magazine. This means that more tools
can be defined in the tool table than there is room for in the tool magazine [(MP7260) > (MP7261)]. If
a tool number is programmed and no pocket is defined for it, pocket number 255 (W262) is
transferred on TOOL CALL, and marker M2401 is set.
Only the tool number and the pocket number are transferred when TOOL DEF is programmed. A
TOOL DEF for a manual tool has no relevance in the PLC.
A variety of tool types can be called from the machining program. The following definitions are used
in the examples that follow:
N = Tool for which a pocket number is defined in the tool table. (Normal).
M = Tool for which no pocket number is defined in the tool table. These tools must be changed
by hand. (Manual).
S = Special tool (defined in tool table).
Nine different combinations of toolchange sequence are therefore possible. For many toolchange
sequences, for the tool magazine to be controlled, two pocket numbers (tool numbers) must be
output in succession for one TOOL CALL. This is reported to the PLC by markers M2093 and
M2600. The PLC must evaluate and acknowledge both pocket numbers (tool numbers).
The logic diagrams for the nine different toolchange sequences are shown on the following pages
(activated by TOOL CALL).