
UCERB 08 User's Guide Installing the UCERB 08
CH
CL
No function
No function
Configures relays 5-8
Configures relays 1-4
Figure 2-2. Typical board switch
Port CL consists of relays 1 through 4, and Port CH consists of relays 5 through 8.
Remove from the enclosure to access the on-board switches
To change the configuration of a switch, you must first remove the UCERB 08 from the enclosure.
Relay control logic parity
Configure the
Invert/non-invert switch (S1) to set the relay control logic polarity for each relay bank for
invert or non-invert. By default, this switch is shipped with all banks configured for non-inverted logic, as
shown in . Figure 2-3
Figure 2-3. Invert/non-invert switch S1
NON-INVERTINVERT
CH
CL
S1
PULL UPPULL DOWN
CH
CL
NON-INVERT mode: when "0" is written or read back via the USB bus, the relays are not energized.
INVERT mode: when "0" is written or read back via the USB bus, the relays are energized.
Switch settings for polarity can be read back via software through the USB bus. Switch settings for S1 do
not affect the power-on condition.
Relay power-on state
Configure the
Pull-up/pull-down switch (S2) to set the state of each relay bank at power-up. By default,
this product is shipped with the switch for all banks configured for pull-down (relays inactive at power
up), as shown in . Figure 2-4
Figure 2-4. Pull-up/pull-down switch S2
S2
When set to pull-up, the relays are put into an energized state at power-up, regardless of the state of
switch S1. When set to pull-down, the relays are put into a non-energized state at power-up.
Switch settings can be read back via software through the USB bus.
2-3
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