Siemens SINUMERIK 840C Installation Instructions Manual page 311

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

6.6.2 Spindle-specific MD bits (spindle bits)

Bit 5=0 The new speed setpoint is output immediately on a gear stage change.

Bit 5=1 Spindle speed not accepted until acknowledged by PLC.

Bit 4=0 C axis mode is maintained

Bit 4=1 C axis mode is switched off on RESET

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Default value

A SINUMERIK 840C system can include up to 6 spindles.

Active: POWER ON

Instead of being decelerated to zero speed on a key-initiated reset, mode

change or M2 / M30, the spindle continues to rotate at the spindle speed last

programmed (spindle override active). In this case, the spindle can be

decelerated with the interface signal "Spindle RESET" (DB 31 DR

EMERGENCY STOP (alarm 2000) and all alarms that result in removal of the

"Mode group ready" interface signal decelerate the spindle to zero speed in all

cases (mode group-specific).

The "Spindle RESET" signal is effective only when the channel to which the

spindle is currently allocated (DB 31 DLK

This bit has no effect on the M19 function (spindle positioning); only NC MD

520*, bit 6, is relevant.

Active: In next block

A newly programmed spindle speed, which requires a gear change (automatic

gear selection in the NC), is not accepted until the gear change has been

acknowledged over the interface (DB31, DRk, bit 7), thus preventing an

unintentional speed increase in the old gear prior to a gear change.

Active: NC STOP

As from SW 5

The new speed setpoint is not output until interface signal "Switch over gear"

has been acknowledged by the PLC user program.

Whether C axis mode is maintained on RESET depends on how bit 4 is set.

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, bits 0 to 4) is in the RESET

6FC5197- AA50

SINUMERIK 840C (IA)

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