Diagnostic Tests; Built-In Diagnostic Tests; Power-Up Self Test; Figure 1-12 Led Status During Power-Up Self Test - Siemens SIMATIC TI505 User Manual

1.6

Diagnostic Tests

Built-in Diagnostic
Tests

Power-up Self Test

1-16 Installation and Set-up
The MODNIM has the following three levels of self tests available.
Power-up Self Tests
Run-time Self Tests
User-initiated Self Tests
The MODNIM executes a Power-up Self Test 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 Test 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 Test 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 Test 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.
NIM
GOOD
XMT
Reset or
Power-up
ON
LINE
1 second

Figure 1-12 LED Status during Power-Up Self Test

PC NIM PC
GOOD GOOD GOOD
REC XMT REC
ON
TEST LINE TEST
5 seconds
SIMATIC TI505/TI500 MODNIM User Manual
NIM PC NIM PC
GOOD GOOD GOOD GOOD
XMT REC XMT REC
ON ON
LINE TEST LINE TEST
Successful Communicating
internal tests with PLC