Siemens SIMATIC S7-300 FM 350-1 Manual page 11

Diagnostic Interrupt
The FM 350-1 can trigger a diagnostics interrupt if any of the following occur:
● External auxiliary voltage faulty
● Fault in 5.2 VDC encoder supply
● Module not assigned parameters or errors in parameter assignment
● Watchdog timeout
● RAM defective
● Hardware interrupt lost
● Fault in signal A, B or N of the 5 V encoder
Pulse Duration
You can specify a pulse duration for the digital outputs of the FM 350-1. The pulse duration
is used to specify how long the corresponding digital output is to be set. A value between 0
and 500 ms may be set for the pulse duration. This value applies to both outputs. You can
adapt the FM 350-1 to existing actuators by specifying a pulse duration.
Which Signals Can the FM 350-1 Register?
The FM 350-1 can register the signals from the following sources:
● Incremental 5-V encoders
● Incremental 24-V encoders
● 24-V pulse encoders with direction level
● 24-V initiators without direction level for example, light barrier or BERO
● Internal 1 MHz time base
Input Filters
For the purpose of suppressing interference, you can assign input filters (RC elements) with
a uniform filter time for the 24 V inputs A*, B*, and N* and for the digital inputs. The following
two input filters are available:
Table 1- 1
Characteristics
Typical input delay
Maximum count frequency
Minimum pulse width of the count signals
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
Input filter
Input Filter 1 Input Filter 2
(default)
1 μs 15 μs
200 kHz 20 kHz
2.5 μs 25 μs
Product Overview
1.1 Properties
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