For Force-OFF, send 0x00 as a “Store Data” command to the address (0X80) which is the address for Force ON/OFF. (For
Force-ON, send 0x01)
Refer to the example below for the “Store Data” command.
Under Force-OFF status, if user sends the "Goal Position" command, it is not necessary to send Force-ON
packet additionally because the "Goal Position" command already includes the "Force-ON" packet in it.
P a g e | 7
Progressive Automations – Position Control Communication Protocol
Force-OFF Function
▪
After the actuator moves to the designated position, the operation stops unless there is an external force that causes
the position value to change. If the position value of the actuator is continuously changing due to vibration or external
force, the actuator will be continuously operating without rest to hold the designated position value, this, in turn, affects
the lifespan of the actuator.
▪
If the Force-OFF function is properly utilized, the motor power can be cut off to allow the motor to rest while maintaining
its position with mechanical friction (mechanical self-lock function). That can be useful even when it is necessary to
hold the position for a relatively long time after reaching a certain position. Shutting off the power of the motor using the
Force-OFF parameter as an added safety function helps to manage the lifespan of the actuator.
▪
Under Force-OFF conditions, communication is still alive while motor power is off, so the actuator will move again when
it gets a new position command without giving the “Force-ON” command.
▪
The Force-OFF feature can be available for the actuators having the “mechanical self-lock” feature. Please see the
chart below to see availability. (The chart shows self-lock force of 1.06” stroke PA-12-R only. Refer to the separate
actuator specifications for the self-lock force of 2.20” stroke models.)
Rated Load
Mechanical Self-Lock
4.5lbs
Not Available
22.48lbs
Available
HEADER
ID
Size
Command
Factor #1
Factor #2
Checksum
Address
Data
0xFFFFFF
0x00
0x04
0xF3
0x80
0x00
0x88
TIP
