Measurement-computing SWITCH Manuel d'utilisateur télécharger pdf (Page 23)

Switch & Sense 8 User's Guide Template Functional Details

Form C relay output

A schematic for form C relay contacts is shown in Figure 4. The form C relay has a C, NO, and NC contact.

 When a (0) is written to the output bit, the C and NC are in contact.

 When a (1) is written to the output bit, the C and NO are in contact.

Figure 4. Form C SPDT relay

Differential isolated digital input terminals (IP0A to IP7B)

Connect up to eight isolated digital input lines using the following screw terminals pairs:

 IP0A and IP0B

 IP1A and IP1B

 IP2A and IP2B

 IP3A and IP3B

 IP4A and IP4B

 IP5A and IP5B

 IP6A and IP6B

 IP7A and IP7B

A schematic of a single channel is shown in Figure 5. Each signal is applied to a bridge rectifier so that the

input is not polarity-sensitive. It can be driven by either AC (50 - 1000 Hz) or DC voltage.

The eight optically isolated (500 V) inputs can be read back as a single byte. Each input has a software-

controlled filter with a time constant of 5 ms (200 Hz). The filter is required for AC inputs, and recommended

for almost all DC inputs. Unless you have a good reason to turn off a filter, we recommend that you enable it.

Refer to "Configuring isolated input filters" on page 19 to learn how to enable and disable the input filters.

Figure 5. Switch & Sense 8 single –channel configuration

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Measurement-computing SWITCH Manuel d'utilisateur Page 23