Siemens SIMATIC FM 450-1 Manual page 32

Wiring the FM 450-1
4
Digital Inputs
Input Filter for
Digital Inputs
Digital Outputs
4-6
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Table 4-2 Input Filters for 24 V Encoder Signals
Features
Typical input delay
Maximum counting frequency
Minimum pulse width of the count
signals
You can use the relevant digital inputs 1I0 and 1I1 (counter 1) or 2I0 and 2I1
(counter 2) for the gate control of the two counters. The gate control can be
both level-controlled and edge-controlled (see Chapter 9).
Digital input 1I2 is used for setting counter 1 to the load value.
Digital input 2I2 is used for setting counter 2 to the load value.
The digital inputs are operated with a nominal voltage of 24 V.
The digital inputs are galvanically isolated from the bus and the counter in-
puts.
For the purpose of suppressing interference, you can parameterize input fil-
ters (RC elements) with a uniform filter time for digital inputs 1I0, 1I1 and
1I2 or 2I0, 2I1 and 2I2. The following two input filters are available:
Table 4-3 Input Filters for Digital Inputs
Features
Typical input delay
Maximum frequency of the input signals
Minimum pulse width of the input signals
The FM 450-1 has the digital outputs 1Q0 and 1Q1 (for counter 1) and 2Q0
and 2Q1 (for counter 2) for direct triggering of control actions. These outputs
are supplied via the load voltage 2L+.
The digital outputs are galvanically isolated from the S7-400 bus and the
counter inputs.
The digital outputs are source outputs and can be loaded with a load current
of 0.5 A. They are protected from overload and short-circuit.
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Input Filter 1 Input Filter 2
(Default)
1 s 15 s
200 kHz 20 kHz
2.5 s 25 s
Input Filter 1 Input Filter 2
(Default)
1 s 15 s
200 kHz 20 kHz
2.5 s 25 s
FM 450-1 Counter Function Module
C79000-G7076-C450-01