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UCERB 08 User's Guide Functional Details

Pull-up/Pull-down switch (S2)

The Pull-up/pull-down switch (S2) sets the power-on state of each relay bank. By default, switch S2 is

configured for pull-down (relays inactive at power-up - see ). Figure 3-3

Figure 3-3. Switch S2 default configuration

PULL UPPULL DOWN

The switch labeled CL configures relays 1 through 4, the switch labeled CH configures relays 5 through 8.

 PULL UP: The relay energizes at power-up, regardless of the state of switch S1.



PULL DOWN: The relays are not energized at power-up.

Use InstaCal to read the current power-on state setting for each module group.

Screw terminals

Connect external devices to the relay contacts using the UCERB 08 board's eight sets of screw

terminals. Each relay has a normally closed (NC), common (C), and normally open (NO) contact.

shows the screw terminals on a typical relay channel.

Figure

3-4

Figure 3-4. Typical relay channel

NC C NO

Each screw terminal is identified with a label on the board and on the underside of the enclosure lid.

Caution! Before connecting wires to the screw terminals, turn off the power to the UCERB 08, and

make sure that the signal wires do not contain live voltages.

Wire gauge

Use 12 AWG to 22 AWG wire to connect field devices. Properly insulate the wires to avoid any short

circuit to the other connections, ground, or other points on the board.

Caution! Keep the length of stripped wire at a minimum to avoid a short to the enclosure! When

connecting your field wiring to the screw terminals, use the strip gage on the terminal strip, or

strip to 5.5 - 7.0 mm (0.215" to 0.275") long.

Daisy chaining additional relays to the UCERB 08

Daisy chained products connect to the USB bus through the high-speed hub on the UCERB 08.

You can daisy chain a maximum of four CyberResearch USB DIO products to a single USB 2.0 port

or USB 1.1 port on your computer.

CyberResearch USB DIO products are USB 1.1 full-speed devices that provide a signaling bit rate of

12 Mb/s. The throughput rate is shared by all devices connected to the USB bus. Use the supplied cable

or an equivalent cable when daisy chaining CyberResearch USB DIO products.

To daisy chain two or more UCERB 08 modules, follow the steps below. This procedure assumes you

already have one UCERB 08 connected to a computer and to an external power source. The UCERB

08 already connected to the computer is referred to as the connected module. The UCERB 08 you

want to daisy chain to the connected module is referred to as the new module.

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CyberResearch UCERB 24 Bedienungsanleitung Seite 18