Measurement-computing CIO-DIO24/CTR3 Instrukcja Użytkownika Pobierz pdf (Strona 16)

CIO-DIO24/CTR3 User's Guide Functional Details

2.2 K SIP installed for pull-up

2.2 K SIP

Dot

+5 VDC

(GND)

User Connector

Digital I/O Lines

COM

Digital

I/O

Port

n = A, B, or C

2.2 K SIP

Dot

+5 VDC

(GND)

User Connector

Digital I/O Lines

COM

2.2 K SIP installed for pull-down

Digital

I/O

Port

n = A, B, or C

Figure 10. Pull-up and pull-down resistor SIPs schematic

To pull-up lines, orient the SIP with the common pin (dot) toward the HI end; to pull-down, install the resistor

with the common pin in the

LO hole.

When installing pull-up and pull-down resistor SIP packs, we recommend using 2.2K, eight-resistor Single

Inline Packages (MCC part number SP-K2.29C). Use a different value only if necessary.

Unconnected inputs float

Unconnected inputs typically float high, but not reliably. If you are using a CIO-DIO24/CTR3 for input and

have unconnected inputs, ignore the data from those lines. You do not have to terminate input lines.

Unconnected lines will not affect the performance of connected lines. Mask out any unconnected bits in

software.

Digital I/O Isolation

To provide external signal conditioning and isolation, you can connect the CIO-DIO24/CTR3 to a CIO-ERB24

or SSR-RACK24. The CIO-ERB24 provides 24 Form C electromechanical relays. The SSR-RACK24 is a

mounting rack for 24 solid-state relays.

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Measurement-computing CIO-DIO24/CTR3 Instrukcja Użytkownika Strona 16