FX Series Programmable Controlers Applied Instructions 5
5-86
e) The available operating modes are split into two main groups, manual and automatic. There
are sub-modes to these groups. Their operation is defined as:
Manual
Manual (selected by device S+0)- Power supply to individual loads is turned ON and OFF by
using a separately provided means, often additional push buttons.
Zero Return (selected by device S+1) -Actuators are returned to their initial positions when the
Zero input (S+5) is given.
Automatic
One Step (selected by device S+2)- The controlled sequence operates automatically but will
only proceed to each new step when the start input (S+6) is given.
One Cycle (selected by device S+3) - The controlled actuators are operated for one operation
cycle. After the cycle has been completed, the actuators stop at their ‘zero’ positions. The
cycle is started after a ‘start’ input (S+6) has been given.
A cycle which is currently being processed can be stopped at any time by activating the ‘stop’
input (S+7). To restart the sequence from the currently ‘paused’ position the start input must be
given once more.
Automatic (selected by device S+4)-Fully automatic operation is possible in this mode. The
programmed cycle is executed repeatedly when the ‘start’ input (S+6) is given. The currently
operating cycle will not stop immediately when the ‘stop’ input (S+7)is given.
The current operation will proceed to then end of the current cycle and then stop its operation.
Note: Start, stop and zero inputs are often given by additional, manually operated push
buttons.
Please note that the ‘stop’ input is only a program stop signal. It cannot be used as a
replacement for an ‘Emergency stop’ push button. All safety, ‘Emergency stop’ devices should
be hardwired systems which will effectively isolate the machine from operation and external
power supplies. Please refer to local and national standards for applicable safety practices.
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