Electro Cam 5000 Series - Manual (Page 62)

Mode 4 Logic Flow Chart
Appendix A-11
Mode 4 Logic Flow Chart
TASK
DECISION
Power Up
Outputs Disabled
Group
Position within
Window?
no
yes
no
Input Signal
Leading Edge
Occurred?
yes
no
Outputs Enabled
yes
Next Input
Window Reached?
1
2
3
4
5
6
The flow chart to the right details how Mode 4 operates.
The control’s response to any set of conditions can be
determined by stepping through the flow chart blocks using
those conditions when decision blocks are encountered.
The flow chart determines when the outputs are enabled
and disabled by Mode 4 logic. Note: Motion ANDing (FCN
7) can also disable outputs.
How to Use the Flow Chart
To use the block diagram assume that the control is
continuously processing the blocks at a very fast rate and
is never stopped on any one block. The control will get
stuck processing the same path of blocks repeatedly (loop)
until a condition changes within one of the decision blocks
in that loop which alters the path. Response to a condition
change is almost instantaneous so the new conditions
established in the next loop take affect quickly. Note that
the logic path can only flow in the direction of the arrows,
never against them.
Rectangle Block
Output enable/disable status or a
logic memory flag is altered.
Diamond Block
A yes/no decision is made based on
the condition stated within the block.
Mode 4 Flow Chart Blocks
1. Control powers up based on the last group position
reference that was programmed into FCN 2.
2. Outputs are disabled.
3. Check group position within the group input window. Go
to step 4 if it is, loop back to step 2 if it is not.
4. Check for leading edge of group enable input signal. If it
occurred go to step 5, if not loop back to step 2.
5. Enable the outputs to cycle at their programmed on/off
setpoints. Go to step 6.
6. Check if group position has reached next input window
(CHN 9X). If yes go to step 2, if no loop back to step 5.
Note: Position can reach input window from forward or
reverse direction.