S5-90U/S5-95U
Start-Up and Program Tests
4.5.2
Peculiarities of the Programmer Functions for the S5-90U and S5-95U
"Input block" Programmer Function for the S5-95U
If the PLC is switched to RUN and if you want to modify or transfer blocks, the scan time is
automatically extended.
When transferring relatively long blocks, this function prevents the PLC from entering the STOP
state and the output of "ZYK" in the ISTACK display (see Section 5.3).
"STATUS - Signal status display" Programmer Function for the S5-95U
The "STATUS" test function analyzes the status of operands involved in the execution of a block.
Consequence: If a STATUS request is given when the cyclic execution of a block starts, the
execution time for this block and hence the scan time is extended.
If a "STATUS" request is present for several processing cycles of the block, the
scan time is extended for each of these cycles.
If you diagnose a block that calls up a function block (see Section 7.3.4) by means of the
"STATUS" function, the statuses of the actual parameters for the function block called are not
displayed in the case of the S5-95U.
"Compress" Programmer Function for the S5-90U
The "Compress" function simultaneously initiates compressing of the program memory (see Section
7.5) and saving of the program on a memory submodules (see Section 4.4.1) if the S5-90U is
switched to STOP and a memory submodule inserted.
"Compress" Programmer Function for the S5-95U
If you activate the "Compress" function while the PLC is switched to RUN, the scan time is
extended automatically.
"ISTACK" Programmer Function for the S5-90U and S5-95U
The interrupt stack (ISTACK) is an internal memory of the PLC where the causes of faults are
stored. Two types of faults exist for the S5-90U and the S5-95U which are displayed in different
ways in the ISTACK. For detailed information see Section 5.4.
4.5.3
Performance Characteristics When Using the Programmer Interface
If you connect a programmer, operator panel or the PLC as SINEC L1 station via the programmer
interface, the performance characteristics of the PLC change in the following respects:
•
The scan time is extended depending on the function currently executing.
•
The interrupt reaction times are extended (see Chapter 10).
•
The maximum counter frequency of the onboard counters is reduced (see Chapter11).
If your S5-95U programmable controller has a second serial interface, you should use the functions
and interfacing capabilities of this interface. The second serial interface definitely imposes less load
on the program cycle than the programmer interface.
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