Rockwell-automation 1791-XXXX Discrete I/O AC and DC Block I/O Input a Manual de usuario descargar pdf (Pagina 18)

I/O Interface and System Design

Chapter 2

2-8

Relay Output

The relay outputs on block I/O modules are electro-mechanical outputs and

do not require specific compatibility with the load device as to current

sinking or sourcing.

Figure 2.10

Simplified

Schematic of Relay Output Circuit

Indication

LED

(logic)

System

Circuitry

12477-I

L1

L2

20-132V ac

R

L

Output

Common

Input/Output

+5V

100Ω

0.033µF

1kΩ

The 16- and 32-point ac and dc block I/O modules are internally fused to

protect the module. No external power fusing is required. Outputs are not

fused. Fusing of outputs is recommended. If desired to fuse an output, you

must provide external fusing.

Table 2.B

Recommended

Fuses

Type of

Circuit

Part Number

1

Size

Rating in

Amps

Maximum Surge Current

2

(repeatable every 2s)

ac

SANO SS21.0 0.25 in. x 1.25 in. 1.0A 3.0A for 50ms

ac

SANO MQ21.0

5mm x 20mm 1.0A 2.5A for 50ms

dc

Littelfuse 322 1.25 0.25 in. x 1.25 in. 1.25A 2.25A for 50ms

dc

SANO MQ4800

5mm x 20mm 800mA

3

2.0A for 50ms

1

Note:

Do not substitute another fuse for those listed.

2

The

recommended fuses will withstand surges of the above listed currents for the time specified.

3

Current must be limited to 650mA when using this fuse.

.

Both ac and dc block I/O modules (except relay output modules) are

derated linearly above 30

o

C up to and including 60

o

C, as shown in

Table 2.C.

For modules with relay outputs, refer to Appendix A for output current and

surge current ratings.

Fusing

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 97 98

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