Tektronix ERA-01 Electromechanical 8-Channel SPDT Relay Output Accessory Board Packing List PA-594 Rev. A User manual

ERA-01 Electromechanical 8-Channel SPDT Relay Output

Accessory Board

Description

Mounted in a covered plastic box, the ERA-01 board provides eight Form C electromechanical relays driven by the "PB" port of
a digital I/O board or a DASCON-1 board. The relays can used for general switching purposes, setting up test configurations,
power switching, etc. The NO (normally open), NC (normally closed) and C (common) relay contacts are connected to screw
terminals. Each relay is energized when the associated “PB” port bit is a logic “1.” A red LED adjacent to each relay lights when
the relay is energized.

Additionally, the ERA-01 provides screw terminals connected directly to the lower four bits of the digital I/O "PC" port bits, PC0
through PC3 (and to 10 KΩ pull-ups as well). These bits, which can be configured as either inputs or outputs, are therefore
available for additional digital I/O. When the ERA-01 is used with a PIO-12, PIO-24, DAS-1200, or DAS-1600 card, the upper
four bits of the digital I/O "PC" port (bits PC4 through PC7) are also connected directly to screw terminals.

The ERA-01 may be powered by the 5 VDC supply of the computer. Alternatively, the ERA-01 may be powered externally from
a regulated +5 VDC supply or a Keithley OPA-01 10 VAC adapter. The ERA-01 converts external AC to regulated +5 VDC.

A user-circuit area is provided, consisting of a matrix of 8 x 13 solder pads, on 0.1" centers, and adjacent solder pads supplied
with +5 VDC power.

The ERA-01 layout is shown in Figure 1. Screw terminal connections are defined in Table 1.

Digital signal
terminal block

External power
terminal block

Internal-external
power selector
switch

37-pin connector, to
DAS card

Relay output screw
terminal blocks

Figure 1. Layout of ERA-01 relay output accessory board

User circuit
area

Relay coil­energized
indicators
(LEDs)

PA-594 Rev. A / 3-98

Table 1. Screw terminal definitions

Screw Screw terminal label Signal identity Directly

terminal
block

Relay
outputs
(J2 and J3)

Digital
signals (J5)

When the ERA-01 is connected to

DASCON-1 card

PB0, PB1, PB2,…PB7

- NO (normally open)

- C (common)

- NC (normally closed)

____

IRQ IN

___

CC

Relay contacts corresponding to
digital outputs PB0, PB1, PB2,…
and PB7 from the digital I/O “PB”
port

______________________

INTERRUPT INPUT

____________

CONV COMP

When the ERA-01 is connected to a
PIO-12/PIO-24 card or to a DAS­1200/DAS-1600 card (at auxiliary
connector)

Relay contacts corresponding to
digital outputs PB0, PB1, PB2,… and
PB7 from the digital I/O “PB” port

INTERRUPT INPUT

________________________

INTERRUPT ENABLE

attached
pin on D
connector
(J1)

N/A*

1

2
PC0 PC0 Directly from lower bits PC0 Directly from lower bits 29
PC1 PC1 of the digital I/O “PC” PC1 of the digital I/O “PC” port. 28
PC2 PC2

port. (A 10 KΩ pull- up

PC2

(A 10 KΩ pull- up resistor

27
PC3 PC3 resistor is attached to each.) PC3 is attached to each.) 26
BSY BUSY PC4 Directly from upper bits 25
CH0 ADR CH ADDR 0 PC5 of the digital I/O “PC” port 24
CH1 ADR CH ADDR 1 PC6 (no pull-up resistors) 23

_________

LD ADR

__

R/H

_______________

LD CH ADDR

_______

RUN/HOLD

PC7

Digital signal common

22

21
GND Digital signal common Digital signal common 11
External AC 10 VAC from Keithley external 10 VAC from Keithley external N/A
power (J4) AC adapter, part number OPA-01 adapter, part number OPA-01 N/A
DC - Regulated 5 VDC from external Regulated 5 VDC from external 11
DC + supply supply N/A
*N/A = not applicable

Specifications

Relays

Number of relays: 8
Relay type: Form C (SPDT)
Contacts: Silver alloy
Contact rating: 3A at 125 Vrms or 28 VDC (resistive), Installation Category II
Contact life, mechanical: 10 million operations
Contact life, electrical: 100,000 operations at full load
Operate time: 20 ms max.
Release time: 10 ms max.

Other hardware

Breadboard area: 0.7 in x 1.2 in (1.78 cm x 3.05 cm) (8 x 13 solder pad matrix)
PC bus power available: +5V
Number of LEDs: (8 red, one per relay)

Environmental

Operating temperature range: 0 to 60 °C
Storage temperature range: -40 to +100

°

C

Humidity: 0 to 90% non-condensing

Power and Signal Requirements

+5V power: 760 mA typical, 800 mA max. (all relays energized)
Logic level to energize relay (make): "1" logic high
Switching load current for relay "off" (break): 0.018 mA

2