Moog ACV with CANopen bus interface
5 Device control
Device state machine (DSM)
B99224-DV018-D-211, Rev. A, October 2018
51
5.2.2.4.1 DSM state transitions depending on the enable signal
The enable signal can cause different valve responses ('HOLD' or 'DISABLE'). The response to the enable
signal is specified by the servo valve type designation number 13 within the order code. The configuration is
set by Moog during the production and cannot be changed by software. These hardware dependent options
are shown in the following tables.
If the enable signal changes from 1 to 0, a state machine transition is triggered to either state 'HOLD' (closed
loop) or state 'DISABLED' (open loop).
Servo valves with the type designator 13 in the order code of O:
There is no reaction to the enable signal at all. With power ON, the valve always will switch to state 'ACTIVE'.
Servo valves with the type designator 13 in the order code of B, D, F, H, L and R:
If the enable signal is switched off (0 V), the state machine will switch to state 'DISABLED'.
Servo valves with the type designation number 13 in the order code A, C, E, G, J, K, M, S and T:
If the enable signal is switched off (0 V), the state machine will switch to state 'HOLD'. Depending on the se-
lected control mode, a specific hold position is controlled.
Chapter "5.2.1 DSM states", page 47
Chapter "6.2.3 Spool position setpoint value path", page 59
Chapter "6.2.4 Pressure setpoint value path", page 61
5.2.2.4.2 Fault confirmation with the enable signal
Toggling the enable signal from low to high causes the device state machine to erase all errors. If no error is
pending, the state machine will exit the fault state.
State transitions do not necessarily refer to a specific spool position or change of spool position.
The specific spool position also depends on the chosen failsafe function on type designator posi-
tion 6, the pilot connection type designator position 7 and the availability of pilot pressure.
WARNING
Moving machine parts!
The word "failsafe" means not a personnel safety. Parts of the machine can move if the servo valve has a
fault.
If a personnel safety is needed, some additional electrical and hydraulic parts are necessary!
Enable signal
Transition (TR)
Old DSM state
New DSM state
Comments/Conditions
1 -> 0
TR5, TR6
'HOLD', 'ACTIVE'
'DISABLED'
RMHD
≤
1001
TR15
'FAULT_HOLD'
'FAULT_DISABLED'
Enable signal
Transition (TR)
Old DSM state
New DSM state
Comments/Conditions
1 -> 0
TR5
'ACTIVE'
'HOLD'
RMHD
≤
1001
-
'FAULT_HOLD'
No change
Enable signal
Transition (TR)
Old DSM state
New DSM state
0 -> 1
TR10
'FAULT_DISABLED'
Depending on the #ControlWord#
TR11
'FAULT_HOLD'
Depending on the #ControlWord#