Tektronix PB-24SM User manual

Keithley Instruments, Inc.

28775 Aurora Road
Cleveland, Ohio 44139
[phone]
Fax: [phone]
www.keithley.com

for SM Series solid-state relay modules

Packing List Manual

Introduction

Model PB-24SM 24-channel mounting board

This document provides safety and installation information for the PB-24SM solid-state I/O module mounting board.

Description

The PB-24SM is an industry-standard baseboard that holds 24 SM Series miniature solid-state I/O modules. The PB-24SM con­nects I/O modules to a Keithley PIO-SSR Series digital I/O board or to a KPCI-3107/3108 analog/digital I/O board (via an in­termediate accessory).

Safety summary

WARNING

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions
required to avoid possible injury. Read the operating and safety information carefully before using the product.

Users of this product must be protected from electric shock at all times. The responsible body must ensure that users are pre­vented access and/or insulated from every connection point.

Do not connect switching boards directly to unlimited power circuits. When connecting sources to switching cards, install pro­tective devices to limit fault current and voltage to the card.

Read and follow the “Safety Precautions” discussed at the end of this manual.

Installation

WARNING

CAUTION

Install your PB-24SM accessory as follows:

Users of this product must be protected from electric shock at all times. The responsible
body must ensure that users are prevented access and/or insulated from every connection
point. In some cases, connections must be exposed to potential human contact. Product
users in these circumstances must be trained to protect themselves from the risk of elec­tric shock.

Ensure that the computer power is turned OFF before installing the PB-24SM. Con­necting the PB-24SM to the computer while the power is ON can damage your com­puter, the accessory, or both.

1. Shut down and turn OFF your computer, and turn OFF power to any circuits that are connected to the PB-24SM accessory.

PA-699 Rev. B / 6-02

2

•

•

2. Connect the PB-24SM accessory to your PIO-SSR Series board, KPCI-3107 board, or KPCI-3108 board as in Figure 1.

Figure 1

Connecting the PB-24SM to PIO-SSR, KPCI-3107, and KPCI-3108 boards

PIO-SSR-12 at 50-pin header,

PIO-SSR-24 at one of two 50-pin headers, or

PIO-SSR-120 at one of five 50-pin headers

KPCI-3107

or KPCI-3108 at “Digital”

(bottom) connector

CAB-1284CC cable

——

——

CAB-SSR cable

STA-3108-D1

——

accessory

PB-24SM board-

——

edge connector

——

CAB-SSR cable

PB-24SM board-

——

edge connector

3. Inventory the spare current available at the computer +5V power bus. The spare current is the remaining current capacity
that is not already used by the computer and all installed boards, including the PIO-SSR or KPCI-3107/3108 board.

4. Compare the spare current available at the computer +5V power bus with the total current required by the PB-24SM and
all modules that will be installed therein.

If the spare current available at the computer +5V power bus does not exceed the total current required by the PB-24SM
and all modules that will be installed—within a reasonable safety margin—do the following:

a. Move the replaceable 1A fuse (Little Fuse 251001 or equivalent) to the position that is closest to the external-power

terminal block. See Figure 2. This action disconnects the PB-24SM accessory from the computer +5V power bus
and connects it to the external-power terminal block.

Figure 2

Powering the PB-24SM from an external +5V power supply

External-

Powe r

Terminal Block

+

Replaceable 1A Fuse in
External-Power Posi­tion

PB-24SM Accessory

External

+5V Power

Supply

+

b. Connect an unpowered (switch OFF) +5V power supply to the external power terminal block, ensuring that you

observe correct polarity. See Figure 2.

If the spare current available at the computer +5V power bus exceeds the total current required by the PB-24SM and
all modules that will be installed—within a reasonable safety margin—do the following: move the replaceable 1A fuse
(Little Fuse 251001 or equivalent) to the position that is furthest from the external power terminal block. See Figure 3.
This action connects the PB-24SM accessory to the computer +5V power bus.

Figure 3

Powering the PB-24SM from the computer +5V power bus

External-

Powe r

Terminal Block

+

Replaceable 1A Fuse in
Computer-Power-Bus
Position

PB-24SM Accessory

5. Install modules in the PB-24SM according to Table 1, installing only input modules for ports that will be configured as
input ports and only output modules for ports that will be configured as output ports.