To Next Page

To Previous Page

1.4.2 Digital Input/Output Modules

The digital input module receives digital signals and converts them into internal data in the

safety control unit, or converts internal data and outputs digital signals.

ypes of Digital Input/Output Modules

The following types of digital input/output modules are available in ProSafe-RS:

• SDV144 : Non-voltage contact input, 16 channels, module isolation

• SDV521 : 24 V DC output, 4 channels, module isolation

• SDV526 : 100-120 V AC output, 4 channels, module isolation

• SDV531 : 24 V DC output, 8 channels, module isolation

There is a different behavior between SDV531-S13 and SDV531-S23/-S33 as follows

when a short circuit occurs on the field side:

• SDV531-S13

When short-circuit occurs on the field side, the Output Shutoff Switch is activated and

the output of all channels on the module becomes OFF. When the short-circuit error

is resolved, the outputs can be recovered by starting the output module from the SCS

Status Management Window and performing the Output Enable Operation. Then the

recovered output channels will output the application logic values. Without performing

the Output Enable Operation, all the outputs will be kept OFF.

• SDV531-S23/-S33

When short-circuit occurs on the field side, the output of output channel correspond-

ing to that field device becomes OFF. When the short-circuit error is resolved, the

output channel can be recovered by performing the Output Enable Operation. Recov-

ered channel will output the application logic values. Without performing the Output

Enable Operation, this channel will output the fail-safe value.

• SDV531-L : 24 V DC output, 8 channels, module isolation, long distance type

• SDV53A : 48 V DC output, 8 channels, module isolation

• SDV541 : 24 V DC output, 16 channels, module isolation

External View of Digital Input/Output Modules

The connections with the digital I/O modules vary with the types of adapters. Pressure clamp

terminals, terminal boards (with signal cable interface adapter) and MIL cables are used for

the connections. The following figure shows the external view of the SDV144, SDV541, and

SDV531. Since SDV521, SDV526 and SDV53A have a built-in signal cable interface adapter,

they can be connected only through the terminal board.

<1.4 Input/Output Modules > 1-16

IM 32Q06C10-31E 4th Edition : Jan.30,2015-00

YOKOGAWA SSC60D User Manual

Questions and Answers: