
Introduction
7
PCIe-7256
1.7 External LED Connection
16 onboard LEDs indicate the operating status of the 16 relays. In
addition, 16 external LED connectors are available for users appli-
cations. Utilizing external LEDs connecting with JP3 and JP4,
relay status can be displayed on chassis, panel, or other appara-
tus. Only LEDs with forward voltage (Vf) lower than 2V can func-
tion. Each external LED connector has a current limiting resistor
(330
Ω
) connecting with +3.3 V power, eliminating the need for
addition of a resistor to limit current flow through the LED.
Before connecting external LEDs, ensure the LED is in the right
direction, as shown.
Figure 1-3: External LED Connectors
JP4
A
K
DO8
DO9
DO10
DO11
DO12
DO13
DO14
DO15
9
16
JP3
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
1
8
Содержание PCIe-7256
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