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SR, shift register
313
02/16 MN05013001Z EN
Example 2
Different workpieces are moved along a production line with
several machining stations. An operator determines the
work required for the individual workpieces, creates a
production code for it and writes it into a shift register.
The workpieces reach the machining stations in this order.
When the workpiece is changed, the stations read the
required production steps from their permanently assigned
register field.
When workpiece 1 moves to the first station, the forwards
pulse input coil SR01FP and the shift register SR01 receive
production code 1 at input SR01I1 from the double word
marker MD11.
Production code 1 is now at the register field SR01D1 for the
first machining station which reads it from double word
marker MD01.
The completed workpiece is now passed to station 2. The
shift register accepts the production code for the next
workpiece. Production code 1 moves one place forwards, as
does the remaining register content. It now stands at
register output SR01D2. It reaches machining station 2 via
double word marker MD02.
The process is repeated for each further workpiece and for
each further machining station until the finished workpieces
leave the line.
The coils are programmed in the standard circuit diagram of
easySafety:
Figure 151: easySafety circuit diagram for example 2
• The enable coil SR01EN is permanently active, the
function block is not switched off.
• Marker M09 switches the forwards pulse input coil
SR01FP.
------------------------------
Ä
SR01EN
M 09--------------------------
Ä
SR01FP
Содержание easySafety
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