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USB DIO High Voltage and Relay

USB-ERB Series

Output Specification

Number of relays

USB-ERB08: 8

USB-ERB24: 24

Relay configuration

USB-ERB08: 2 banks of 4

USB-ERB24: 2 banks of 8 and 2 banks of 4

Contact configuratio

USB-ERB08: 8 Form C (SPDT) normally open (NO), normally closed (NC) and

common (C) available at screw terminals

USB-ERB24: 24 FORM C (SPDT) NO, NC and C available at screw terminals

Contact rating: 5 A @ 240 VAC or 28 VDC resistive

Contact resistance: 100 m

Ω max (initial value)

Operate time: 10 ms max

Release time: 5 ms max

Vibration: 10 Hz to 55 Hz (dual amplitude 1.5 mm)

Shock: 10 G (11 ms)

Dielectric isolation

Between relay open contact: 300 VAC, 50/60 Hz (1 minute)

Between PCB output lines: 500 VAC, 50/60 Hz (1 minute)

Life expectancy: 10 million mechanical operations, min

Power on RESET state

S2 = pull-up: Energized. NO in contact with Common

S2 = pull-down: Not energized. NC in contact with Common

Relay control logic polarity: User-configurable per bank through switch S1 for

invert or non-invert (default). Switch settings for polarity can be read back with

software over the USB bus. Switch settings do not affect the power-on condition.

Non-invert mode: When 0 is written or read back via the USB bus, relays are

not energized.

Invert mode: When 0 is written or read back via the USB bus, relays are ener-

gized.

Pull-up/pull-down (controls relay power on state): User-configurable per bank

through switch S2 for pull-down (default) or pull-up. Switch settings can be

read back with software.

• Pull-down puts the relays in non-energized mode on power up.

• Pull-up puts the relays in energized mode on power up.

Power

USB +5 V input voltage range: 4.75 V min to 5.25 V max

USB +5 V supply current (all modes of operation): 10 mA max

Voltage supervisor limits - PWR LED

6.0 V > Vext or Vext > 12.5 V: PWR LED = Off (power fault)

6.0 V ≤ Vext < 12.5 V: PWR LED = On

The daisy chain power output option allows multiple MCC USB Series products

with a USB hub output port to be powered from a single external power source

in a daisy chain fashion. The voltage drop between the device power supply

input and the daisy chain output is 0.5 V max. Users must plan for this drop

to assure the last device in the chain receives at least 6.0 VDC.

E

xternal power consumption

All relays on, 100 mA downstream hub power

USB-ERB08: 750 mA typ, 850 mA max

USB-ERB24: 1.5 A typ, 1.8 A max

All relays off, 100 A downstream hub power

USB-ERB08: 170 mA typ, 200 mA max

USB-ERB24 230 mA typ, 270 mA max

Specifications - USB-ERB Series

USB-ERB24 Block Diagram

USB

Microcontroller

USB

Interface

USB

USB

USB

Interface

Interface

Interface

USB

Interface

Power

Regulator

Power

Monitor

9.0 V

External

Power

9.0 V

External

Power

Switch S2

(pull-up/down))

Switch S2

Switch S2

Switch S2

(pull-up/down)

(pull-up/down)

(pull-up/down)

Switch S2

(pull-up/down)

Switch S1

S1

(inv/non-inv)

Switch S1

Switch S1

Switch S1

(inv/non-inv))

(inv/non-inv)

(inv/non-inv)

Switch S1

(inv/non-inv)

Relay 24

Relay

driver

4

Relay

driver

Relay

Driver

Relay

driver

4

Relay

driver

Relay

Driver

Relay

driver

8

Relay

driver

Relay

Driver

Relay

driver

8

Relay

driver

Relay

Driver

Screw terminal

Relay 23

Relay 22

Relay 21

Relay 20

Relay 19

Relay 18

Relay 17

Relay 16

Relay 15

Relay 14

Relay 13

Relay 12

Relay 11

Relay 10

Relay 9

Relay 8

Relay 7

Relay 6

Relay 5

Relay 4

Relay 3

Relay 2

Relay 1