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Response Times IP 240
12.3 Firmware Execution Times
The execution time of the individual firmware slices depends on
the modes in which the channels are operated,
the configuring data and
the current actual value.
The table below shows the
base times which the firmware needs in each cycle to process channel 1 and channel 2.
the additional times needed only in the firmware cycle in which the setpoint is reached or in
which an error occurs.
the execution time for a data interchange in the relevant mode.
When computing the response time, you must always assume the maximum value for a data inter-
change.
Position decoding mode
Table 12-1. Firmware Execution Times, Position Decoding Mode
Description
Base time without configuring 45 µs
Abbrev.
Max. execu-
tion time
t
A
Base time for position decoding without track comparison
Base time per track comparison without hysteresis
Base time per track comparison with hysteresis
Additional time for entering and exiting a track
Additional time for IP 240 to set or reset an output (per DQ)
Additional time for IP 240 to generate an interrupt
(for each interrupt bit set)
Time for a data exchange
Data Read
Data Write
t
WS1
t
WS2
t
W
520 µs
160 µs
230 µs
t
WZ1
30 µs
t
WZ2
45 µs
t
WZ3
30 µs
t
kom
t
kom
430 µs
740 µs
Example:
Channel 1: Base time without configuring t
A
= 45 µs
Position decoding modes t
W
= 520 µs
6 tracks used, without hysteresis 6 x t
WS1
= 960 µs
In one FW cycle,
a track can be entered, t
WZ1
= 30 µs
an output set and
the other output reset and 2 x t
WZ2
= 90 µs
an actual value-dependent interrupt generated. t
WZ3
= 30 µs
----------------
t
ka1
= 1675 µs
12-4
EWA 4NEB 811 6120-02a
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