
Date Code 980420
Operation Within SEL-2030
4-5
SEL-2711 Instruction Manual
If you get a network error response, you are probably not using the correct device address or
routing path. If you get an invalid function code response, then you are not properly requesting
holding registers using function code 3. If you get an illegal data address error response, you are
not properly reading the initial registers. If you get a busy error response, try again.
Once you get successful responses, you can configure the SEL-2030 to collect the data of interest
and you can configure your host devices to read this data.
R
OUTING
P
ATHS
The SEL-2711 is a host-based network adapter. To make a successful Modbus Plus request to the
SEL-2711, the last non-zero digit in your routing path must specify an application task number.
This is also referred to as a Data Slave path number. The SEL-2711 supports 8 Data Slave paths,
so the last non-zero digit in the routing path must be in the range 1-8. For example, if your
SEL-2711 has a Modbus Plus node address of 12, then other Modbus Plus nodes on the same
network should use a routing path such as 12.1.0.0.0.
See
Section 3: Operation and Network
Configuration
for more information on routing paths.
S
TATUS
A
CCESS
The SEL-2030 provides status information on the SEL-2711 in two ways. The STATUS
command shows the state of the SEL-2711 and indicates any errors.
Appendix B: Error Codes
and Messages
lists the possibilities.
The Global Region within the SEL-2030 also has status information. See
Section 6:
Database
in
the
SEL-2020/2030 Reference Manual
for additional information on this data.
C
ONFIGURING
R
ELAY
P
ORTS
There are many kinds of relay data in the SEL-2030 that can be accessed by the SEL-2711. To
make this data available to the SEL-2711, the SEL-2030 must be configured to collect this data.
The
SEL-2030 User’s Guide
describes how to configure the SEL-2030 to read this data. The
following screen capture shows a typical configuration sequence based on using an SEL-251-3
relay on Port 2 of the SEL-2030:
*>>
SET P 2<ENTER>
SET P 2<ENTER>
Port communications settings for Port 2
Device Type (U=Unused, S=SEL IED, O=Other IED,
P=Printer, M=Master) DEVICE = S ?
<ENTER>
<ENTER>
Auto-configure port (Y/N) CONFIG = N ?
Y<ENTER>
Y<ENTER>
Attempting auto-configuration...Done.
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