A7DP-2 datasheet(24/25 Pages) OMRON

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Precautions

Environment

Do not use where gases are generated (ammonia, chlorine, sulfur

dioxide).

Although Switches are of nearly dust-proof construction, they are

not drip-proof, therefore do not use in areas subject to water or oil

exposure and do not operate with wet or oily hands. (The A7MD has

a dust-proof construction on contact parts, but consider your instal-

lation location carefully. The A7MA is not of dust-proof construc-

tion.)

Provide additional dust-proofing measure when using in sand-ex-

posed areas.

Setting Numbers

Locking Type

Set with the setting button by raising it.

Return the button to its original position after setting. It is then locked

to prevent rotation, and the set numbers will not change accidental-

ly.

Pen-push Type

To set, press the setting button with a ball-point pen or other pointed

object. However, avoid using pencils or mechanical pencils as bro-

ken lead or lead dust may enter and damage the Switch.

Handling

Use alcohol to wipe off dirt and smudges from the molded-plastic

cases. Take care to prevent the alcohol from getting inside.

Do not use thinner or other solutions which might damage the plas-

tic.

When connecting Switches, fit the mating parts together.

When separating Switches, use a screwdriver as shown in the fig-

ure below; disconnect them by releasing the top and bottom hooks.

Do not push the (+) and (–) operating push-buttons at the same time

with undue force.

Terminals for PCB Models

When using terminals for printed circuit boards, make the terminal

insertion holes in the back board (mother board) 1 mm or larger in

diameter.

Do not use excessive force in handling terminals for printed circuit

boards. In particular, take care to avoid dropping them as the termi-

nals might bend or break.

Reference: Terminals can withstand a force of 0.8 g for 1 minute or

more, and survive bending of 20

° without breaking after

returning to original position.

The A7MD accommodates only printed circuit boards. When pulling

out the operating surface from the back of the panel, refer to the fig-

ures for panel mounting dimensions. However, it cannot be fas-

tened alone to the panel.

Connectors

Insert Connectors while keeping the arrow pointing up (refer to page

31).

Connector insertion load is about 1.5 kg for each A7B-C.

Setting the Stopper (A7BS-20

j-S)

With the A7BS-20

j-S, any range can be set outside with the Stop-

per Pin. Insert the Stopper Pin using the following procedure:

(3) Stopper Pin (upper limit)

(2) Stopper Pin (lower limit)

(1) Display window

Example: To Display the Range 0 to 7

1. Any number within the range of (0 to 7) can be chosen to limit

the numbers displayed in the display window. (In this

example, 8 and 9 are outside of this range.)

2. First, insert the Stopper Pin in the hole in front of the lower limit

(“0”) for the number to be defined.

3. Next, inset the Stopper Pin in the hole past the upper limit (“7”)

for the number to be defined. (The Stopper Pins then

surround the exact range to be defined.)

4. Confirm that the (+) push-button can no longer be pushed

after reaching the upper limit of (“7”).

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