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USB-SSR08 User's Guide Functional Details

External power connectors

The USB-SSR08 has two external power connectors labeled POWER IN and POWER OUT on the enclosure.

The

POWER IN connector is labeled PWR IN on the board, and the POWER OUT connector is labeled PWR

OUT

on the board.

Connect the

POWER IN connector to the supplied +9 V external power supply. External power is required to

operate the USB-SSR08. The

POWER OUT connector lets you power additional daisy chained MCC USB

Series products from a single external power supply. Depending on your load requirements, daisy chained

products may require a separate power supply. Refer to "Power limitations using multiple USB-SSR08 devices

on page 3-4 for more information.

USB LED

The USB LED indicates the communication status of the USB-SSR08. This LED uses up to 5 mA of current

and cannot be disabled. explains the function of the USB LED. Table 3-2

Table 3-2. USB LED Illumination

LED Illumination Indication

Steady green The USB-SSR08 is connected to a computer or external USB hub.

Pulsing green

Initial communication is established between the USB-SSR08 and the computer, or data is being

transferred.

PWR LED

The USB-SSR08 incorporates an on-board voltage supervisory circuit that monitors the external 9 V power. If

the input voltage falls outside of the specified ranges the

PWR LED shuts off. Tab explains the function of

the PWR LED.

le 3-3

Table 3-3. PWR LED Illumination

PWR LED

illumination

Indication

Steady green External power is supplied to the USB-SSR08.

Off

Power is not supplied by the external power supply, or a power fault has occurred. A power fault

occurs when the input power falls outside of the specified voltage range of the external supply

(6.0 V to 12.5 V).

I/O module type switch (S1)

Switch S1 is a four-position switch that sets the type of each module group for input or output (default). You

cannot mix input and output modules within a group. You can use InstaCal to read the current I/O type

configuration for each module group. shows switch S1 configured with its default settings. Figure 3-2

Figure 3-2. Switch S1 default configuration

OUTIN

3-2

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