Rules Governing the Use of the S5-115F
S5-115F Manual
Note
•
Interval monitoring for user timer updating calls is deactivated if the value 16383 is
entered for ”User timer updating: Max. interval” when the operating system
parameters are set via COM 115F.
•
Interval monitoring for interrupt processing calls is deactivated if the value 255 is
entered for ”Interrupt processing: Max. interval” when the operating system
parameters are set via COM 115F.
10.6
Discrepancy Times
I/O accesses are monitored for discrepancy times. I/O read accesses are monitored for signal
discrepancies in both subunits in order to detect hardware faults.
The discrepancies must reach permissible values within the programmed discrepancy times: Binary
signals must be identical in both subunits. The analog values of both subunits must lie within a
programmable tolerance range.
•
Short discrepancy times ( Vol. 2, 1.1.1 of the Manual) are configured uniformly for certain
modules. They lie between 10 msec. and 255
*
10 msec.
An input is scanned either until the
time has elapsed or the values match.
•
Long discrepancy times ( Vol. 2, 1.2.3 of the Manual) are configured separately for each
input. They lie between 100 msec. and 27 min 19 sec. The value of the last scan is transferred to
the process input image until either the time has elapsed or the values match. During this time,
the program continues to be scanned.
You will find an overview of discrepancy times in Table 10-1.
Table 10-1. Programmable Discrepancy Times
Module
Type of access
Discrepancy time
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
Digital input with interrupt
capability
Digital input without interrupt
capability
Direct
Cyclic
Short discrepancy time for DI with
interrupt capability
Short discrepancy time for DI without
interrupt capability or long discrepancy
times
Analog input
Readback digital input
FB 250 ANEI
PLC cycle time
Short discrepancy time for DI without
interrupt capability
Digital input without interrupt
capability
Direct
No discrepancy analysis.
The uniform value is not derived from the
current values, but the last valid value is
used. The user is not informed of the use
of this substitute value.
10-10
EWA 4NEB 811 6148-02
