Siemens simatic s7-400 FM 450-1, User Manual, Page: 117 / 130

Technical Data
12.2 Technical Data
Counter module FM 450-1
Manual, 02/2014, A5E03648739-02
117
Status, interrupts, diagnostics
Status display
Yes, 14 green LEDs for status of CR, DIR, inputs and outputs
Interrupts
• Hardware interrupt
Yes, configurable
•
Diagnostic interrupt
Yes, configurable
Diagnostics functions Yes
•
Fault indication for internal and external faults
Yes, 2 red LEDs
• Reading diagnostics information
Yes
Data to the count signals and the digital inputs and outputs (applies to both counters)
Counter inputs 5 V (A , /A; B, /B; N, /N)
• Level
In compliance with RS 422
•
Terminating resistor
approx. 220 Ohms
•
Differential input voltage
Min. 0.5 V
• Maximum count frequency
500 kHz
• Electrical isolation toward S7-400 bus
No
Counter inputs 24 V (A*, B*, N*)
•
Low Level
- 30 ... + 5 V
• High level
+ 11 ... + 30 V
• Input current
Typically 9 mA
•
Minimum pulse width (maximum count frequency)
≥ 2.5 µs (200 kHz)
≥ 25 µs (20 kHz)
(configurable)
Digital inputs
• Low Level
- 28.8 ... + 5 V
•
High level
+ 11 ... + 28.8 V
•
Input current
Typically 9 mA
•
Minimum pulse width (maximum input frequency)
≥ 2.5 µs (200 kHz)
≥ 25 µs (20 kHz)
(configurable)