Performance
Section 3-2
28
Maximum I/O response time
The figure below shows the maximum I/O response time in synchronous
mode. The figure shows the timing at the PLC, the timing at the Master Unit,
the timing at the slave input and the timing at the slave output.
t
IN
: The Input Slave’s ON (OFF) delay
t
OUT
: The Output Slave’s ON (OFF) delay
t
PC
: The Poll cycle time of the respective master
t
RF
: The I/O refresh time
t
PE
: The Program Execution time
The maximum response time can occur under the following conditions.
1.
The slave in question is polled by the respective master at the beginning of
the poll cycle.
2.
The poll cycle time of the respective master is less than the program
execution time of the PLC program.
3.
The Input data is available just after the master polled the respective
slave.
The I/O response time in the case above is:
t
RESPONSE
= t
IN
+ 3 x t
PE
+ 3 x t
RF
+ t
OUT
Note:
With t
PC
is meant the time that the master of the respective slave
needs to poll all slaves that have been assigned to this master.
Содержание C200HW-PRM21
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