S5-90U/S5-95U
Addressing and Access to I/Os
6.5
Start-Up with/without External I/Os and Parameterization of Internal
Timers (S5-95U only)
You can set some system characteristics in the "SDP:" (System-Dependent Parameters) parameter
block of data block 1 (DB1). The syntax of DB1 and the procedure for parameterizing DB1 are
described in Section 9.4. Please refer to this Section.
The following can be selected (parameterized):
•
How many of the 128 internal timers are continuously executed by the processor (NT 128
parameter)
and
•
Whether the PLC is to take into account external I/O modules during restart (PBUS N
parameter)
Before giving an example for assigning parameters for parameter block "SDP:", we will explain the
meaning of the two system characteristics you can assign with the parameters.
The parameter for the internal timer "NT" is preset so that all 128 timers are constantly being
processed. You can shorten the required processing time if you set only the internal timers that you
really need.
The "PBUS" parameter is preset so that the programmable controller starts up without being
connected via the external I/O bus (PBUS N).
If you want to be certain that the PLC starts up only if the I/O bus is connected, you have to change
the parameter (PBUS J).
The following Table describes the start-up characteristics of the PLC depending on the setting of
the DB1 parameter "PBUS" and the connection of the external I/O bus.
Table 6-8. Start-Up Characteristics of the PLC, Depending on the PBUS Setting and the
External I/O Bus
Ext.
PBUS
I/O Bus
Connected
PBUS N
(Specified in DB 1)
PBUS J
(Specified in DB1)
No
PLC starts up and enters the RUN
mode
PLC recognizes PEU and enters the
STOP mode
Yes
Has PLC recognized the external I/O
bus during start-up?
Yes:
• PLC enters RUN mode, i.e.
bus correctly configured,
I/Os can be addressed;
• PLC recognizes PEU and
enters the STOP mode, i.e.
incorrect bus configuration
No:
• PLC enters the RUN mode
and I/Os are not addressed
Has PLC recognized the external I/O
bus during start-up?
Yes:
• PLC enters RUN mode, i.e.
bus correctly configured,
I/Os can be addressed;
• PLC recognizes PEU and
enters the STOP mode, i.e.
incorrect bus configuration
No:
• PLC recognizes "PEU" and
enters the STOP mode
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EWA 4NEB 812 6115-02b
6-23
Содержание SIMATIC S5-90U
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