Function modules 7.9 Basic positioner

The drive is limited to this velocity if a higher velocity is specified or programmed via the override (p2646) for the reference point approach or is programmed in the traversing block.

Parameter p2571 (maximum velocity) defines the maximum traversing velocity in units 1000 LU/min. If the maximum velocity is changed, then this limits the velocity of a traversing task that is presently being executed.

This limit is only effective in the positioning mode for:

Jog mode

Processing traversing blocks

Direct setpoint input/MDI for positioning/setting-up

Reference point approach

Maximum acceleration/deceleration

Parameter p2572 (maximum acceleration) and p2573 (maximum deceleration) define the maximum acceleration and the maximum deceleration. In both cases, the units are 1000 LU/s2.

Both values are relevant for:

Jog mode

Processing traversing blocks

Direct setpoint input/MDI for positioning and setting-up

Reference point approach

The parameters do not have any effect when faults occur with the fault responses OFF1 / OFF2 / OFF3.

In the traversing blocks mode, the acceleration and deceleration can be set in multiple integer steps (1 %, 2 % ... 100 %) of the maximum acceleration and deceleration. In “direct setpoint input/MDI for positioning and setting up” operating mode, the acceleration/delay override (assignment of 4000 hex = 100%) is specified.

Note

A maximum acceleration or deceleration dependent on the actual velocity (transitioned acceleration) is not supported.

Note

When using the PROFIdrive message frame 110, the velocity override is already connected and has to be supplied by the message frame.

Software limit switches

The connector inputs p2578 (software limit switch minus) and p2579 (software limit switch plus) limit the position setpoint if the following prerequisites are fulfilled:

The software limit switches are activated (p2582 = "1")

The reference point is set (r2684.11 = 1)

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Drive Functions

Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

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Efficient Networks S120 manual Maximum acceleration/deceleration, Software limit switches