Tektronix PB-24 User manual

Keithley Instruments, Inc.

28775 Aurora Road
Cleveland, Ohio 44139
[phone]
Fax: [phone]

Model PB-24 24-channel mounting board

for standard-size solid-state relay modules

Packing List Manual

Introduction

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

Description

The PB-24 is an industry-standard baseboard that holds 24 standard-size solid-state I/O modules. (It also can accommodate SM
Series miniature solid-state I/O modules.) The PB-24 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-24 accessory as follows:

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

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

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. If the circuit is capable of operating at or above 1000 volts, no conductive part
of the circuit may be exposed.

Ensure that computer power is turned OFF before installing the PB-24. Connecting the PB­24 to the computer while power is ON can damage your computer, the accessory, or both.

Figure 1

Connecting the PB-24 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

——

——

edge connector

PB-24 board-

CAB-SSR cable

——

PB-24 board-

edge connector

PA-701 Rev. B / 11-00

•

•

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-24 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-24
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 equiv alent) to the position that is closest to the external-po wer

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

Figure 2

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

External-

Power

Terminal Block

External

+5V Power

Supply

+

+

Replaceable 1A Fuse in
External-Power Posi­tion

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-24 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-24 accessory to the computer +5V power bus.

Figure 3

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

External-

Power

Terminal Block

+

Replaceable 1A Fuse in
Computer-Power-Bus
Position

PB-24SM Accessory

PB-24 Accessory

5. Install modules in the PB-24 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.

CAUTION

Install only input modules or only output modules for all bits of any given port (port
A, B, or C for the KPCI-3107/3108; port A, B, C-lower, or C-upper for the PIO-SSR.)
The port configuration determines whether input or output modules are installed. For
example, if port B is configured as an output port, the modules for bits PB0, PB1,...
PB6, and PB7 must all be output modules. Failure to match all modules for a given
port to the port configuration may result in damage to the PB-24, to the connected I/O
board, or to both.

6. Wire your external circuits to the PB-24 screw terminals according to Table 1, based on the input and output modules that
you have installed.

2