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Technical Description
Programmable Restart Delay at Cold Restart and After Power Restore
If you want to delay checking the module configuration because, for example, switching the
voltage to a remotely connected EU is delayed, you must modify system data word 126 (EAFC
one of the following ways:
•
With the DISPL ADDR programmer function (only permissible when the CPU is in the STOP
mode!)
•
With STEP 5 operations in the control program (only in FBs).
In any event, the restart delay will only become effective after the next POWER OFF
transition and remains effective until the next modification to this system data word. After
Overall Reset, the default applies (0000
sponds to a restart delay of 1 ms; the longest possible delay is 65535 ms (FFFF
Example:
Programming a restart delay of approximately one minute
STL FB98
:L KH EA60
:T BS 126
:BE
Note
If no backup battery has been inserted in the power supply module (or if the inserted
battery is defective) and the control program is stored on an E(E)PROM submodule,
the restart will be delayed by approximately one second.
Restart
While the CPU is in RESTART, the following applies:
•
The fault LEDs are dark; the RUN, STOP and BASP LEDs light up
•
All output modules are disabled (outputs show signal "0")
•
The PII is not yet updated; evaluation of the inputs is only possible with direct I/O access
(L PY../L PW..)
Example:
L PW 0
T IW 0
A I
0.0
:
•
Scan time monitoring is inactive
•
The relevant RESTART OB is processed (in the case of manual cold restart of OB21, in the case
of automatic cold restart of OB22 - if the mode selector is at "RN")
•
Timers are processed
•
Interrupt OBs (OB2 to OB6) and timed-interrupt OBs (OB10 to OB13) are only processed if the
interrupts are explicitly enabled (RA operation).
2-16
, i.e. no delay). One unit in system data word 126 corre-
H
Explanation
Restart delay of 60,000 ms (1 minute)
S5-115U Manual
) in
H
POWER ON
).
H
EWA 4NEB 811 6130-02b
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