Load value
You can determine an initial value (load value) for each counter on the FM 450-1 The counter is
set at the initial value if a software or hardware-related signal to the module comes up.
Hardware interrupts
When comparison values are reached, for overow, underow and/or for zero crossing of a
counter, the FM 450-1 can trigger a Hardware interrupt.
Diagnostic interrupt
When the following events occur, the FM 450-1 can trigger a diagnostic interrupt:
• External auxiliary voltage faulty
• Encoder 5.2 VDC supply faulty
• 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 determine a pulse duration for the digital outputs of the FM 450-1. The pulse duration
is used to specify how long the corresponding digital output is to be set. You can specify a value
between 0 and 500 ms for the pulse duration. This value applies to both outputs. By prescribing
a pulse duration you can adapt the FM 450-1 to existing actors.
Which signals can the FM 450-1 count?
The FM 450-1 can count signals that are generated by the following encoders:
• Incremental 5-V encoders
• Incremental 24-V encoders
• 24-V pulse encoders with direction level
• 24-V initiators without direction level
e.g., light barrier or BERO
Product Overview
1.2 Properties
Counter module FM 450-1
10 Equipment Manual, 03/2022, A5E03648739-AC
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