S8AS datasheet(7/26 Pages) OMRON

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S8AS

Constructions and Nomenclature

Nomenclature

S8AS-24006

S8AS-48008

Note: The noise value depends on the wiring method and other factors. Insert

a clamp filter (recommended: E04SR301334 manufactured by SEIWA)

on the communications wiring as a countermeasure against noise.

*1. The fuse is located on the (L) side.

*2. This is the protective earth terminal specified in the safety

standards. Always ground this terminal.

*3. In Test Mode, the tripping alarm output (TRP) will operate even if

one or more of the branch outputs is set to OFF. This error output,

however, will not be held when operation moves to another

operating mode.

*4. Wire the polarity of the external tripping input correctly. After

completing wiring, confirm that the input operates correctly.

*5. The branch output indicators are OFF when current is not used.

*6. 6.Information on procedures for detailed displays is given in

Status Indicators on page 16.

Yrs

°C

S8AS-24006

POWER SUPPLY

-V

RS485

A(-)

B(+)

50/60Hz AC100-240V 3.8A

INPUT

Class2

OUTPUT

DC 24V 3.8A

- 5

- 4

- 3

- 2

- 1

- 6

+ 5

+ 4

+ 3

+ 2

+ 1

+ 6

V.ADJ

DC ON

COM

TMP

TRG

LFE

LOW

TRP

Yrs

6 7 8

°C

S8AS-48008

POWER SUPPLY

50/60Hz AC100-240V 7.4A

INPUT

COM

TMP

TRG

LFE

LOW

TRP

V.ADJ

DC ON

+ 5

+ 4

+ 3

+ 2

+ 1

+ 6

+ 7

+ 8

- 5

- 4

- 3

- 2

- 1

- 6

- 7

- 8

-V

Class2

OUTPUT

DC 24V 3.8A

RS485

A(-)

B(+)

COM

TMP

TRG

LFE

LOW

TRP

(A) (B) (C) (D) (E) (F) (G)

5. I/O Signal Terminal Internal

Circuit Configuration

Photoswitch

No.

Name

Functions

AC Input Terminals (L and N)

Connects the input power supply

(100 to 240 VAC, 50/60 Hz)

(commercial power supply).

Protective Earth (PE) Terminal (

) Connects to the ground wire.

Positive Branch Output Terminals (+)

Screwless terminals with 2-pole

terminals for each branch output.

Negative Branch Output Terminals (

−)

Screwless terminals with 2-pole

terminals for each branch output

and screw terminal shared by the

negative branch output terminals.

I/O

Signal

Terminals

(A)

Tripping Alarm

Output (TRP)

Turns ON to indicate when an

abnormal voltage or current was

detected and the output was cut

off. (The photoswitch output will

turn OFF.)

(B)

Undervoltage

Detection Output

(LOW)

Turns ON to indicate when the 24-

VDC output voltage of the S8AS falls

below the threshold due to decrease

in input voltage or other factors. (The

photoswitch output will turn OFF.)

(C)

Maintenance

Forecast Monitor

Output (LFE)

Turns OFF to indicate when the

number of years to the set

replacement time has been

reached. (The photoswitch output

will turn OFF.)

(D)

Over-temperature

Output (TMP)

Turns ON to indicate that the

temperature exceeded the over-

temperature output threshold. (The

photoswitch output will turn OFF.)

(E)

Negative Common

Terminal (COM)

(no polarity)

Negative common shared by the

four alarm outputs ((A) to (D)) above.

(F)

Positive External

Tripping Input (TRG+) Can be used to send an input

signal from an external device to

cut off a branch output.

(G)

Negative External

Tripping Input (TRG

−)

Output Indicator (DC ON (Green))

Indicates whether there is output

voltage supplied.

Output Voltage Adjuster (V.ADJ)

Adjusts the output voltage.

Seven-segment Display (Red)

Displays measured values or set values.

Branch Output Indicators (Orange)

Light or flash when there is a

display related to branch output

(outputs 1 to 6 and 8).

Unit Indicators (Orange)

Light or flash when there is a unit (e.g.,

V, A, Yrs,

°C, s) related to the value

shown on the 7-segment display.

Status indicators (Red/Green)

Indicate the status of the branch outputs:

Cutoff: red, Connected: green.

Operation

Keys

Reset (RST) Key

Used to clear the error status when

a branch output was cut off by an

error or there was an alarm output.

Enter (ENT) Key

Used to switch the display item,

enter or execute settings, etc.

Up (SEL) Key

Used to change the display item

forward or to increase a set value.

Down (CH) Key

Used to switch the branch output

or to decrease a set value.The

branch output number that is set

remains the same in other modes.

Communications Terminals (A (

−),

B (+))

(Only for Models That Support

Communications)

Used to connect to the RS-485

communications line.

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