Siemens SINAMICS S120 Function Manual page 275

SW limit switch + reached (r2683.7)
SW limit switch – reached (r2683.6)
These status signals indicate that the parameterized negative p2578/p2580 or
positive p2579/p2581 traversing range limit was reached or passed. If both status
signals are 0, the drive is located within the traversing limits.
Stop cam minus active (r2684.13)
Stop cam plus active (r2684.14)
These status signals indicate that the stop cam minus p2569 or stop cam plus
p2570 were reached or passed. The signals are reset if the cams are left in a
directly opposing the approach direction.
Axis moves forwards (r2683.4)
Axis moves backwards (r2683.5)
Axis accelerates (r2684.4)
Drive decelerates (r2684.5)
Drive stationary (zero speed) (r2199.0)
These signals display the current motion status. If the actual absolute speed is less
or equal to p2161, then the status signal "drive stationary" is set – otherwise it is
deleted. The signals are appropriately set if jog mode, reference point approach or
a traversing task is active.
Cam switching signal 1 (r2683.8)
Cam switching signal 2 (r2683.9)
The electronic cam function can be implemented using these signals. Cam switch-
ing signal 1 is 0 if the actual position is greater than p2547 – otherwise 1. Cam
switching signal 2 is 0 if the actual position is greater than p2548 – otherwise 1.
This means that the signal is deleted if the drive is located behind (after) the cam
switching position. The position controller initiates these signals.
Direct output 1 (r2683.10)
Direct output 2 (r2683.11)
If a digital output is parameterized, the function "direct output 1" or "direct output
2", then it can be set by a corresponding command in the traversing task (SET_O)
or reset (RESET_O).
Following error in tolerance (r2684.8)
When the axis is traversed, closed-loop position controlled, using a model, the per-
missible following error is determined from the instantaneous velocity and the
selected Kv factor. Parameter p2546 defines a dynamic following error window that
defines the permissible deviation from the calculated value. The status signal indi-
cates as to whether the following error is within the window (status 1).
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Extended Functions
Function module "basic positioner"
4-275