Emerson Control Techniques FM-4 Reference Manual page 188

FM-4 Programming Module Reference Manual
Bit Number Value
Bit.B#
This read/write bit may be used in a program as an intermediary variable bit controlled by the user. Bit.B# is one of 32 bits
that make up the BitRegister parameter. Assigned to communication networks such as DeviceNet, Profibus and Modbus,
Bit.B# may be used to transfer events that have occurred in a PLC to the FM-4/4 program.
Note
When the value of Bit.B# is changed, the value of BitRegister.#.Value is changed as well.
Bit Register Number Value
BitRegister.#.Value
This parameter is made up of the combination of the 32 Bit.B#. The BitRegister.#.Value. The BitRegister.#.Value register
may be accessed bitwise by using Bit.B#, or double word-wise by using BitRegister.#.Value.
Bit Register Number Value Mask
BitRegister.#.ValueMask
This parameter is the Mask for the BitRegister.#.Value. Each bit location is set to either transfer the current data in the
corresponding bit location of BitRegister.#.Value (by setting the bit location to 1) or to clear the current data in
BitRegister.#.Value (by setting the bit location to 0).
Brake Activate
Brake.Activate
This destination, when activated, engages the brake. This is simply used to manually engage the brake outside of the normal
brake operation. This is level sensitive.
Brake Disengaged
Brake.Disengaged
This source is used to control the motor holding brake. When it is "off" the brake is mechanically engaged. When the brake
is engaged, the diagnostic display on the front of the drive will display a "b". The drive and module outputs are limited to 150
mA capacity, therefore, a suppressed relay is required to control the brake coil. Model BRM-1 may be used.
Brake Release
Brake.Release
This destination will release the brake under all conditions, even when Brake.Activate is engaged. When this input function
is active, the Brake.Disengaged output function (source) will be activated. This is used as a manual brake override.This is
level sensitive.
Clear Following Error
ClearFollowingError
Clear Following Error is a destination found in the Position group on the Assignments view. When this destination is
activated, any following error that has accumulated will be erased. Following Error is cleared by setting the commanded
position to the feedback position, automatically resulting in a zero following error. The FM module will deactivate the Clear
Following Error destination as soon as Following Error is zero.
Commanding Motion
CommandingMotion
This source activates when VelCommand is non-zero.
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