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Section 13
Troubleshooting
Indicated result
(Protocol name) Fail
(I/O module name)
Ready
(I/O module name) Fail
13.1.2.2
Communication Diagnostics
All the communications in the IED (Front port and rear LAN AB/CD ports) can be supervised via the local
HMI under Main menu/Diagnostics/Communication .
IEC140000115 V1 EN-US
Figure 32:
Denial of Service on Communication Ports
The denial of service functions (DOSFRNT, DOSOEMAB and DOSOEMCD) are designed to limit the
CPU load that can be produced by Ethernet network traffic on the IED. The communication facilities must
not be allowed to compromise the primary functionality of the device. All inbound network traffic will be
quota controlled so that too heavy network loads can be controlled. Heavy network load might for
instance be the result of malfunctioning equipment connected to the network.
DOSFRNT, DOSOEMAB and DOSOEMCD measures the IED load from communication and, if
necessary, limit it for not jeopardizing the IEDs control and protection functionality due to high CPU load.
The following outputs are available in ACT via PCM600 for each DOS function block:
156
Possible reason
Protocol has failed.
No problem detected.
I/O modules has failed.
The PMU communication diagnostic menu
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Proposed action
None.
Check that the I/O module has been configured and connected to
the IOP1- block.
If the problem persists, contact your Hitachi Power grids
representative for service.
IEC140000115-2-en.vsd
1MRK 511 409-UUS Rev. K
GUID-48F15E30-D40D-451B-854F-09CFA77C7082 v1
GUID-863D9132-C2E5-41F5-970E-3B232E4F231E v1
Phasor measurement unit RES670
Commissioning manual
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