CPU Module
4-14
LED Name Description Status
E1 RX
**
Ethernet Port 1 – RX
(receive)
Green LED
ON – Receiving Data
In case of RAM test and startup failure, see
Table 4-2 and Table 4-3.
I1 ACTV
*
Internal Port 1 (INTR1) for
Redundancy (active)
Green LED
ON – This CPU is the active CPU.
OFF – This CPU is the standby CPU or the
system does not include Redundancy.
I1 L/RX
**
Internal Port 1 (INTR1) for
Redundancy (link/receive)
Green LED
ON – There is a link between the active and
standby CPUs.
Blinking – There is a link between the active
and standby CPUs and data is being
received.
OFF – The system does not include
Redundancy.
PI2 TX Plug-in Port 2 – TX
(transmit)
Green LED
ON – Transmitting Data
PI2 RX Plug-in Port 2 – RX (receive)
Green LED
ON – Receiving Data
PI2 CM Plug-in Port 2 – CM (channel
monitor)
Green LED
ON – Channel Busy (if port is in use by radio,
RS485, or RS232)
– Network Connected (if an IP plug-in is
used)
D1 RX
**
USB Device Port – RX
(receive)
ON – Receiving Data
USR1-
USR4
User application program
LEDs
Green LED
Controlled by the user application program.
Light consecutively and repeatedly one after
the other when entering boot mode.
**
The LED names E1 LNK and RX and D1 RX appear only in CPU 3640 and CPU 3680.
*
The LED names I1 ACTV, I1 L/RX, H1 LNK1/LNK2, and D1 RX appear only in CPU 3680.
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