Emerson P/N 400361-00 manual AbsolutePosnValid, Accelerating, AccelType, AccelUnits.Decimal, AtVel

11 Parameter

Descriptions

This section lists all programmable and feedback parameters available. The parameters are listed alphabetically by variable name (shown in italics below the on screen name) and give a description. Range is dynamic and depends on User Unit scaling. The units of the parameters are dynamic and depend on selected User Units.

Absolute Position Valid

AbsolutePosnValid

This source is activated when either the DefineHome destination is activated, or any home is successfully completed (sensor or marker found). This source is deactivated if the drive is rebooted, an encoder fault occurs, the drive is powered down, or a home is re-initiated.

Accelerating

Accelerating

This source is active when the SM-EZMotion module is executing an acceleration ramp. A normal index consists of 3 segments: Accelerating, At Velocity, and Decelerating. The Accelerating source will be set (active) during this acceleration segment regardless of whether the motor is speeding up or slowing down. Therefore, this source can sometimes be active when the motor is decelerating. This could be true when compounding indexes together.

Acceleration Type

AccelType

This parameter is used to select the accel/decel type for all motion (homes, jogs and indexes). The “S-Curve” ramps offer the smoothest motion, but lead to higher peak accel/ decel rates. “Linear” ramps have the lowest peak accel/ decel rates but they are the least smooth ramp type. “5/8 S-Curve” ramps and “1/4 S-Curve” ramps use smoothing at the beginning and end of the ramp but have constant (linear) accel rates in the middle of their profiles. The “5/8 S-Curve” is less smooth than the “S-Curve” but smoother than the “1/4 S-Curve”. S-Curve accelerations are very useful on machines where product slip is a problem. They are also useful when smooth machine operation is critical. Linear ramps are useful in applications where low peak torque is critical. Below is a comparison of the 4 ramp types:

•S-Curve: Peak Accel = 2 x Average Accel

•5/8 S-Curve: Peak Accel = 1.4545 x Average Accel

•1/4 S-Curve: Peak Accel = 1.142857 x Average Accel

• Linear: Peak Accel = Average Accel

Acceleration Decimal Places

AccelUnits.Decimal

This parameter is the decimal point location for all real-time accel./decel. ramps.

Acceleration Time Scale

AccelUnits.TimeScale

This parameter is the time units for accel./decel. ramps. Possible selections are milliseconds or seconds.

At Velocity

AtVel

This source is active when the SM-EZMotion module is executing a constant velocity motion segment. One example would be during an index. The source would activate after the motor has finished accelerating up to speed and before the motor begins to decelerate to a stop. A normal index consists of 3 segments: Accelerating, At Velocity, and Decelerating. This source is active during the At Velocity segment, and is activated based on the commanded velocity, not the feedback velocity. During synchronized motion, AtVel can be active without actual motor movement.

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 SM-EZMotion 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

Parameter Descriptions www.emersonct.com 85