Axis Status "Finished" Or "Running" 2 - 5; Digital Inputs/Outputs And Their Effects; Inputs And Outputs To The Power Unit - Siemens SIMATIC S5 Manual

Digital inputs/Oufputs and their Effects
2.7.6 Axis Status ''Finished"or "Running"
An axis can only be switched from one mode to another in the axis status "finished". Providing
the job itself is correct, the axis status is changed from "finished" to "running". In this respect,
there is no difference between traversing jobs and jobs which do not lead to a traversing move-
ment, e.g. coordinate transformations, or data transfer. On completion of the current job, the
axis status once changes to the "finished" status. In automatic operation, the axis status is only
set to "finished" on completion or interruption of the machining program (see next section).
2.7.7 "Position Reached" Message
The "position reached" axis attribute is closely related to the axis status. In positioning jobs with
absolute or relative target specifications, the "position reached" message signals the correct com-
pletion of the job. The "position reached" message is set when the target is reached.
One exception is to be found in automatic operation. While the axis status in automatic operation
only changes from "running" to "finished" on completion of the whole machining program, the
"position reached" message is generated after each traversing statement and each dwell time.
Response to abnormal termination of positioning jobs
If a job with absolute or relative target information is terminated before the target is reached, this
axis attribute is not set. The remaining distance to go to the actual target point remains indicated.
It is updated if you subsequently execute a tool offset, You can now send a relative traversing
job with the indicated "distance to go" to the module. The originally required target is then
reached.
2.8

Digital Inputs/Outputs and their Effects

2.8.1

Inputs and Outputs to the Power Unit

The I P247 positioning module has digital inputs and outputs via which it is connected to the
power units and to the plant. It has one input connected to the PC, via which the BASP signal
(block command output) can be received from the CPU.
Control and ready signals are exchanged with the power unit.
Control signals:
Positioning pulses Tx, E x = (axis 1,2, 3)
Direction RPx, RPx
Reset RSx, RSX
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