Spindle-Specific Md Bits (Spindle Bits) - Siemens SINUMERIK 840C Installation Instructions Manual

Siemens computer drive installation instructions

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6 NC Machine Data (NC MD), NC Setting Data (NC SD)

6.6.2 Spindle-specific MD bits (spindle bits)

thread cutting

Default value

Bit 7 Bit 7=1 When this bit is set, a change in the following error (due to a change in the

spindle speed) results in a thread fault!

Only the leading spindle of the channel may be programmed before first programming and

during activated G33, G96 and G97.

Bit 6 Bit 6=1 M19 is active until the "Acknowledge M19" interface signal is generated,

without regard to RESET (or to M02/M30 etc.).

(Refer also to the Section entitled "Axis (Analog) and Spindle Installation".)

Bit 5 Bit 5=1 No waiting for positioning of the main spindle; instead, the next program block

(which might include axis movement) is executed when M19 is output to the

PLC. Positioning (M19) is also terminated with an M3 or M4 in the part

Bit 5=0 No acknowledgement with M3 or M4 (block search)

Bit 4 Bit 4=1 Oriented spindle stop

When this bit is set, the NC can stop the spindle at specific positions. S

analog and encoder are required. See Section 6.

Bit 3 Bit 3=1 The programmed S word is given the dimension 0.1 rev/min, i.e. the speed

range lies between 0.1 rev/min and 1600 rev/min. This bit is required for actual

speed monitoring only; the spindle setpoint (speed) is specified in NC MD

403* to 410*. The actual value is always displayed in whole revolutions. For the

actual spindle speed monitor, the minimum speed is always approximately 2

rev/min for the 0.1 rev/min and 1 rev/min settings.

When using this bit it should be noted that a value is entered in MD 403* that is 10 times

spindle stop

6FC5197- AA50

SINUMERIK 840C (IA)

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