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Installation and Set-up
1-16
SIMATIC TI505/TI500 MODNIM User Manual
1.6 Diagnostic
T
ests
The
MODNIM has the following three levels of self tests available.
• Power
-up Self T
ests
•
Run-time Self T
ests
• User
-initiated Self T
ests
The MODNIM executes a Power
-up Self T
est in the following cases.
•
Immediately after you apply +5 VDC power from the I/O base as part of
initialization.
•
Any time the Reset button is pressed.
The Power
-up Self T
est checks the processor and performs a test of on-board
RAM and ROM. At the start of the test, all MODNIM indicators are turned
on for approximately 1 second, then all except the TEST MODE indicator go
off for about 5 seconds.
If the Power
-up Self T
est is successful, the NIM GOOD light turns on, and
the MODNIM attempts to establish communications with the PLC. If this is
successful, the PC GOOD (PC/NIM COMM GOOD) light turns on and the
MODNIM is ready for normal network control (see Figure 1-12).
If the Power
-up Self T
est fails, the TEST MODE indicator remains on and
the MODNIM will not respond to any communication attempts.
If the PLC does not respond, the PC GOOD (PC/NIM COMM GOOD)
indicator remains off, and the MODNIM will issue an exception response
with Error Code 04 (failure in associated device) to any host computer
initiating an interactive request to this MODNIM. In addition, the TEST
MODE indicator flashes at a 3-second interval, remaining on for 1 second.
Reset
or
Power-up
NIM
GOOD
PC
GOOD
XMT REC
ON
LINE
TEST
NIM
GOOD
PC
GOOD
XMT REC
ON
LINE
TEST
1 second
5 seconds
NIM
GOOD
PC
GOOD
XMT REC
ON
LINE
TEST
Successful
internal tests
NIM
GOOD
PC
GOOD
XMT REC
ON
LINE
TEST
Communicating
with PLC
Figure 1-12 LED
Status during Power
-Up Self T
est
Built-in Diagnostic
Tests
Power
-up Self T
est
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