1PosSSI/Analog
6.6 Functions of the 1PosSSI/Analog
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
261
Effect of the Hardware Limit Switches
The two digital inputs (DI0 and DI1) are evaluated by the 1PosSSI/Analog as hardware limit
switches:
● DI0 is the minus limit switch and limits the operating range in the minus direction.
● DI1 is the plus limit switch and limits the operating range in the plus direction.
You can assign parameters to the hardware limit switches separately as break contacts or
make contacts.
The hardware limit switches are evaluated with linear axes and rotary axes.
Only the hardware limit switch that lies in the direction in which the drive is being moved is
evaluated.
This enables you to move away from a hardware limit switch without additional error
acknowledgment by moving in the other direction if you reach or overrun a hardware limit
switch.
The current signal level of the digital inputs is displayed in the feedback interface, delayed by
the update rate.
You can see from the following table what effect the hardware limit switches have in the
individual MODEs:
MODE Effect of the Hardware Limit Switches
Search for Reference The 1PosSSI/Analog automatically reverses the direction using
deceleration and acceleration when a hardware limit switch is reached.
Inching
Absolute Positioning
Relative Positioning
The motion of the axis is halted at the hardware limit switch with the output
of 0 V on the analog output, and the feedback bit POS_ERR is reported.
Starting on the hardware limit switch
Direction Response of the 1PosSSI/Analog
Starting into the operating range The 1PosSSI/Analog starts the specified MODE.
Starting away from the operating range The POS_ERR=1 feedback bit is set.
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