<8. Detailed Description>
• Minimum ON detection time and Maximum ON/OFF cycle
NFDV151 and NFDV161 have minimum ON detection time of 20 ms and
maximum ON/OFF cycle of 25 Hz.
This means that the modules can be used for input of pulses whose ON time for
one pulse is at least 20 ms and whose frequency is up to 25 Hz.
• Limitations of NFDV161
The NFDV161 input module has 64 input channels, but push button input can
only be defined for input channels 1 to 32.
8.1.4 Checking Specification of Pulse Width Output
Pulse width output can be implemented using a pulse width output module
(NFDV532) or a digital output module (NFDV551, NFDV557, NFDV561).
● Checking Specification of NFDV532 (Pulse Width Output Module)
NFDV532 provides 4 channels of Up Pulse/Down Pulse pair for pulse width output.
Although not many points can be installed in one I/O module, the module supports
high-resolution pulse width output.
Check that the specification of the NFDV532 matches the specification of equipment
used.
SEE ALSO
For details, see Section A1.6.2, “Digital I/O Module (Specification)” of IM “STARDOM FCN/FCJ Guide.”
• Minimum output pulse width
NFDV532’s minimum output pulse width is 2 ms and its output unit is 2 ms.
• Defining operation upon CPU failure
The operation of NFDV532 when CPU failure is detected is configurable on
module basis but not on channel basis.
Details about CPU failure detection are the same as described in Section 8.1.2.
Output fallback setting
HOLD : Resets all output channels to OFF after outputting all pulse signals
when CPU failure is detected.
OFF : Resets all output channels to OFF when CPU failure is detected.
NO : Do nothing when CPU failure is detected.
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