Measurement-computing SWITCH AND SENSE 8/8 Manuale Utente Scaricare il pdf (Pagina 13)

Switch & Sense 8/8 User's Guide Functional Details

3-2

External power LED

The LED labeled EXTERNAL POWER lights up when the Switch & Sense 8/8 is connected to an external

power source. It uses up to 5 mA of current and cannot be disabled.

Status LED

The LED labeled STATUS indicates the communication status of the Switch & Sense 8/8. It uses up to 5 mA of

current and cannot be disabled. Table 3-1 explains the function of the Switch & Sense 8/8 status LED.

Table 3-1. Status LED illumination

LED Illumination Indication

Steady green The Switch & Sense 8/8 is connected to a computer or external USB hub.

Blinks continuously Data is being transferred.

Blinks three times Initial communication is established between the Switch & Sense 8/8 and the computer.

USB connector

The USB connector on the back of the Switch & Sense 8/8 enclosure provides +5 V power and communication.

Internal components

Screw terminals and relays

The Switch & Sense 8/8 has four rows of screw terminals — two outer rows containing 12 terminals each, and

two inner rows containing eight terminals each.

! The outer rows of terminals connect to the eight relays available from the Switch & Sense 8/8.

! The inner rows connect to the differential isolated digital inputs. No additional components are required to

terminate any of the input or output signals.

RELAY 7RELAY 6RELAY 5RELAY 4

RELAY 0RELAY 1RELAY 2RELAY 3

IP7B

IP7A

IP6B

IP6A

IP5B

IP5A

IP4B

IP4A

IP0A

IP0B

IP1A

IP1B

IP2A

IP2B

IP3A

IP3B

Strain Relief for Field Wiring

Figure 3-2. Switch & Sense 8/8 screw terminals and relays

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 19

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Measurement-computing SWITCH AND SENSE 8/8 Manuale Utente Pagina 13