Parker iqan-mc3, Руководство пользователя

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40
Digital outputs
7 I/O functionality
Instruction book, IQAN-MC3
Digital outputs
The IQAN-MC3 has two types of digital outputs. While all of the digital outputs are
designed to drive coils for on-off valves, DOUT D-E are also designed to drive
indicators such as LED’s. For current ratings on the DOUT’s, see Appendix A, on page
46.
Connecting loads to digital outputs
Connecting of loads to the digital outputs such as on/off valves is done by using the
DOUT/DRET paired positions.
Protection against voltage transients
A clamping diode must be placed between the digital output and return, as close to the
load as possible. This reduces EMI, it also helps in protecting the output against high
voltage transients. Use the diode:1N5408 (3A/1000V).
Depending on the load, other clamping diodes might be used instead.
DOUT output diagnostics
The DOUT is capable of detecting internal faults as well as wiring faults. The fault will
be identified as one of the following status values in IQANdesign.
• Over load (e.g. over current)
• Open load (e.g. open circuit or under current)
• "Error - internal error in the IQAN-MC3 power driver
The reported status is describing the most likely fault condition, but in certain cases the
status will not match the actual fault. For details on failure modes, see Appendix B, on
page 51.
There are faults that are detected on startup, and that will prevent the module from
starting the application. These are all faults where an output is connected to +BAT on
startup.
To detect these faults, it is important that all connectors are plugged-in before the
module is started. See section Start-up, on page 42, also, see Appendix B, on page 51.
EXAMPLE
Connect the on/off valve to the digital output using the DOUT and the DRET,
respectively.

Connecting a load to the digital output.
d1
IQAN-MC3
DRET
DOUT