CiA 402 Power State Machine
State machine
CiA 402
Controlword
State changes are requested via object 6040h (controlword).
State transitions
The diagram shows the possible state transitions.
Listed in the following table are the bit combinations for the controlword that result in the corresponding state transitions. An X here corresponds to a bit state that requires no further consideration. Exceptions are the resetting of the error (fault reset) and the changeover from Quick Stop Active to Operation Enabled: the transition is only requested by the rising edge of the bit.
| Command | Bit in object 6040h | Transition | ||||
|---|---|---|---|---|---|---|
| Bit 7 | Bit 3 | Bit 2 | Bit 1 | Bit 0 | ||
| Shutdown | 0 | X | 1 | 1 | 0 | 2, 6, 8 |
| Switch on | 0 | 0 | 1 | 1 | 1 | 3 |
| Disable voltage | 0 | X | X | 0 | X | 7, 10, 9, 12 |
| Quick stop | 0 | X | 0 | 1 | X | 11 |
| Disable operation | 0 | 0 | 1 | 1 | 1 | 5 |
| Enable operation | 0 | 1 | 1 | 1 | 1 | 4 |
| Enable operation after Quick stop | 0 | 1 |  |
1 | 1 | 16 |
| Fault / warning reset | |
X | X | X | X | 15 |
Statusword
Listed in the following table are the bit masks that break down the state of the controller.
| Statusword (6041h) | State |
|---|---|
| xxxx xxxx x0xx 0000 | Not ready to switch on |
| xxxx xxxx x1xx 0000 | Switch on disabled |
| xxxx xxxx x01x 0001 | Ready to switch on |
| xxxx xxxx x01x 0011 | Switched on |
| xxxx xxxx x01x 0111 | Operation enabled |
| xxxx xxxx x00x 0111 | Quick stop active |
| xxxx xxxx x0xx 1111 | Fault reaction active |
| xxxx xxxx x0xx 1000 | Fault |
After switching on and successfully completing the self-test, the controller reaches the Switch on disabled state.
Operating mode
Behavior upon exiting the Operation enabled state
Halt motion reactions
Various halt motion reactions can be programmed upon exiting the Operation enabled state.
The following graphic shows an overview of the halt motion reactions.
Quick stop active
Transition to the Quick stop active state (quick stop option):
In this case, the action stored in object 605Ah is executed (see following table).
| Value in object 605Ah | Description |
|---|---|
| 0 | Switch off driver without deceleration ramp; drive function blocked – motor can turn freely |
| 1 | Braking with slow down ramp (deceleration ramp depending on operating mode) and subsequent state change to Switch on disabled |
| 2 | Braking with quick stop ramp (6085h) and subsequent state change to Switch on disabled |
| 5 | Braking with slow down ramp (deceleration ramp depending on operating mode) and subsequent state change to Quick stop active; control does not switch off and the motor remains energized. You can switch back to the Operation enabled state. |
| 6 | Braking with quick stop ramp (6085h) and subsequent state change to Quick Stop Active; control does not switch off and the motor remains energized. You can switch back to the Operation enabled state. |
The Quick stop active state can also be reached when a limit switch is actuated; see Limitation of the range of motion.
Ready to switch on
Transition to the Ready to switch on state (shutdown option):
In this case, the action stored in object 605Bh is executed (see following table).
| Value in object 605Bh | Description |
|---|---|
| -32768 … -1 | Reserved |
| 0 | Switch off driver without deceleration ramp; drive function blocked – motor can turn freely |
| 1 | Braking with slow down ramp (braking deceleration depending on operating mode) and subsequent state change to Ready to switch on |
| 2 … 32767 | Reserved |
Switched on
Transition to the Switched on state (disable operation option):
In this case, the action stored in object 605Ch is executed (see following table).
| Value in object 605Ch | Description |
|---|---|
| -32768 … -1 | Reserved |
| 0 | Switch off driver without deceleration ramp; drive function blocked |
| 1 | Braking with slow down ramp (braking deceleration depending on operating mode) and subsequent state change to Switched on |
| 2 … 32767 | Reserved |
Halt
The bit is valid in the following modes:
When setting bit 8 in object 6040h (controlword), the action stored in 605Dh is executed (see following table):
| Value in object 605Dh | Description |
|---|---|
| -32768 … 0 | Reserved |
| 1 | Braking with slow down ramp (braking deceleration depending on operating mode) |
| 2 | Braking with quick stop ramp (6085h) |
| 3 … 32767 | Reserved |
Fault
Case of an error (fault):
If an error occurs, the motor will brake according to the value stored in object 605Eh.
| Value in object 605Eh | Description |
|---|---|
| -32768 … -1 | Reserved |
| 0 | Switch off driver without deceleration ramp; drive function blocked – motor can turn freely |
| 1 | Braking with slow down ramp (braking deceleration depending on operating mode) |
| 2 | Braking with quick stop ramp (6085h) |
| 3 … 32767 | Reserved |
For each error that occurs, a more precise error code is stored in object 1003h.
Following/slippage error
If a following or slippage error occurs, the motor is braked according to the value stored in object 3700h.
| Value | Description |
|---|---|
| -32768 … -2 | Reserved |
| -1 | no reaction |
| 0 | Switch off driver without deceleration ramp; drive function blocked – motor can turn freely |
| 1 | Braking with slow down ramp (braking deceleration depending on operating mode) |
| 2 | Braking with quick stop ramp (6085h) |
| 3 … 32767 | reserved |
You can deactivate error monitoring by setting object 6065h to the value "-1" (FFFFFFFFh) or object 60F8h to the value "7FFFFFFFh".