Stange SE-707, Operating Manual

Page: 127 / 244

Program Controller SE-707
© 2018 by STANGE Elektronik GmbH
Subject to technical modifications
127
Editing Limit Values during OPERATION
Normally limit values are configured by the unit manufacturer; therefore, later editing by the unit operating personnel is
disabled.
If it is required by the unit operator, limit value entry or modification can be enabled during operation (parameter “Limit
values Read / Write” on “Yes”). Limit value modification during configuration has no effect then. A limit value buffer is
created in the program memory. The limit values can be edited by using the appurtenant display page or a connected
computer.
NOTE:
The limit value should never be selected to be equal to the maximum value of the input value range, but a little lower to
ensure an exact response of the limit value even at the end of the range (e.g. limit value = 899.5 °C for an actual value range
of 0...900 °C).
Limit Value Request for Segment Time or Remaining Segment Time
With the aid of the internal PLC there can be realized requests concerning the actual segment time or the remaining segment
time. When the program is active (RUN or STOP status) the appurtenant function output is activated as soon as a limit value
has exceeded or fallen short of. The limit value must be configured accordingly and defined in full seconds.
Example:
For a digital value which displays over 20 seconds for a segment time, limit value 1 is configured like follows:
Limit value function code Segment time
Limit value 20
In the internal PLC the following statements must be added:
L FO 0169 (Output 1 is active as soon as the actual segment time is more than 20 sec.)
= O 0001
For a digital output which displays for segment rest time under the last 20 seconds bevor segment end, limit value 2 is
configured like follows:
Limit value function code remaining segment time
Limit value 30
In the internal PLC there must exist the following statements:
L FO 0681 (Output 2 is active as soon as the actual remaining segment
O FO 0684 time is less than 30 sec.)
UN FO 0170
= A 0002