Siemens SINUMERIK 828D Function Manual page 46

A2: Various NC/PLC interface signals and functions
1.2 NC/PLC interface signals
The table below shows the functionality of the interface signals in conjunction with the "controller enable".
DB31, ... DBX1.5 DB31, ... DBX1.6
1 0 (or 1)
0 1
0 0
0 0
1 -> 0 0 -> 1
0 -> 1 1 -> 0
DB31, ... DBX2.1 (controller enable)
Setting the controller enable closes the machine axis position control loop. The machine axis is in position control
mode.
DB31, ... DBX2.1 == 1
Canceling the controller enable opens the machine axis position control loop and, subject to a delay, the machine
axis speed control loop:
DB31, ... DBX2.1 == 0
Activation methods
The closed-loop controller enable for a machine axis is influenced by:
• NC/PLC interface signal:
- DB31, ... DBX2.1 (controller enable)
- DB31, ... DBX21.7 (pulse enable)
- DB31, ... DBX93.5 (drive ready)
- DB10, DBX56.1 (emergency stop)
• NCK-internal
Alarms that trigger cancellation of the controller enable on the machine axes. The alarm responses are
described in:
References:
/DA/Diagnostics Manual
Canceling the controller enable when the machine axis is at standstill:
• The machine axis position control loop opens
• DB31, ... DBX61.5 == 0 (position controller active)
46
DB31, ... DBX2.1 Function
1 Position measuring system 1 active
1 Position measuring system 2 active
0 "Parking" active
1 Spindle without position measuring system (speed-
controlled)
1 Switchover: Position measuring system 1 → 2
1 Switchover: Position measuring system 2 → 1
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions