Interval Counter Input
4-7
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
4.4 Initializing the SM 335’s interval counter input
Parameter assignments
The interval counter on the SM 335 requires no parameters. The pulse input func-
tions independently of the parameters assigned to the remaining analog channels.
The pulse input, therefore, does not have to be parameterized. The external
counter can be retrospectively parameterized with a timeout.
Monitoring time
After the monitoring time has expired, the interval duration FFFFFF
H
is initialized.
This means that a failure can be detected early (not only after 8.3 seconds).
The monitoring time is calculated as follows:
Monitoring time +
8.388
256
· Byte 13 of DS1[unit seconds]
Special case: As a default, ’0’ equates to 8.388 seconds.
Examples:
• Byte 13 (DS1) = 1 → monitoring time = 0.032765625 seconds
• Byte 13 (DS1) = 2 → monitoring time = 0.016382812 seconds
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