Electro Cam PL-1746 Series - Manual (Page 101)

6-4 Groups & Modes
Description Outputs in a Mode 2 group are disabled until the
corresponding input terminal is energized. The
outputs are then enabled to turn on per their pro-
grammed pulses, and the group position imme-
diately resets to the value programmed through
the GROUP OFFSET function. The leading edge
of a pulse in the corresponding group channel
disables the group’s outputs and re-arms the in-
put terminal.
Mode 2 - Reset to Preset Position with One Cycle Enable
Mode 2 Example Application
Two glue heads at different locations on the conveyor are
controlled independently by a single PLuS controller and
resolver. The spacing between parts being glued is random.
The sensors are connected to the input terminals for the
corresponding groups. When a sensor detects a product, it
resets the corresponding group’s position to the preset
values and enables the group’s outputs to turn on the glue
guns at the correct pulse edges.
When parts are not present, the outputs will be inactive.
Applications This mode is used where products may not be
evenly spaced and the group outputs should
cycle only when a product has been sensed.
Details • Outputs are enabled and the group position
resets at the leading edge of the input termi-
nal signal, regardless of how long the terminal
is on.
• Once a reset occurs, the input terminal has no effect until it is de-energized and the
leading edge of a pulse in the corresponding group channel re-arms the terminal.
• When the position of a group resets, group channel is affected in the same manner
as the output channels.
• On power-up, outputs are disabled, the input terminal is armed, and the group posi-
tion is the same as the value programmed in MACHINE OFFSET.
• If position is increasing as shaft rotates, the “on” edge of the pulse will re-arm the
terminal. If position is decreasing as shaft rotates, the “off” edge of the pulse will re-
arm the terminal.
• Each program in the controller can have different pulses for output channels and
group channels.
• MOTION ANDING and OUTPUT ENABLE ANDING can be used with outputs in a
group operating in mode 2.
Mode 2 Programming 1. Program OUTPUT GROUPS to establish groups and modes.
2. Use GROUP OFFSET to program the preset value for any groups operating in
mode 2.
3. Jog the machine to the point where the group input terminal will energize. Using this
point as a reference, program pulses into the output channels in the group.
4. Program a pulse in the group channel to disable the output channels and re-arm the
input terminal. This pulse must be after all of the output channels have completed
their functions, but before the input terminal will be energized.