Publication 1752-UM001A-EN-P - October 2006
194 Function Blocks Command Reference
Program Logic
Muting Sequence
The muting sequence for this example is described below.
1. When the machine’s dangerous area is on the same side as the
operator, N.O. limit switch 1 is off and N.C. limit switch 2 is on.
In addition, the light curtain is not obstructed, so the Output
Enable signal is on. Muting Signal 11, which inputs the dual
channel complementary signal for limit switches 1 and 2, goes
off.
2. As the robotic arm rotates, limit switch 1 goes on and limit
switch 2 goes off when the dangerous area is opposite the
operator. The result of the Estop instruction, which inputs the
dual channel complementary signal for limit switches 1 and 2,
goes on, so muting is enabled, and the muting signal goes on.
3. At this point, the Output Enable signal is kept on even if the
light curtain is obstructed so the operator can access the work
platform.
4. When the operator completes his task and the light curtain is
unobstructed as the robotic arm rotates, the result of the Estop
instruction goes off, the muting status is cleared, and the muting
signal goes off.
To Next Page
Loading...
Need help?
General
