Siemens SIMATIC TIWAY 1 - Manual (Page 176)

ERROR CODES AND DIAGNOSTICS
UNILINK HOST ADAPTER 6–13
USER MANUAL
6.4.4 External I/O Loopback Test
There is a special diagnostic test for the Input/Output Points. This test is active
when Positions 9 and 10 of Dipswitch 2 are up. To run this test, perform the
following steps.
1. Install a 20.0 to 30.0 VDC power supply to the output power terminal
(#3) shown in Figure 6–5.
2. Using a 22 AWG wire, connect the input point terminal (#1) to the
output point terminal (#5).
3. Using another 22 AWG wire, connect the input point return (#2) to the
output point return (#4).
4. Install the loopback connectors provided with the adapter to Port 3 and
Port 4.
5. Apply power to the adapter.
6. Set Positions 9 and 10 of Dipswitch 2 up.
7. Press the reset switch.
Pin
1 – Input
2 – Input Return
3 – Power
4 – Output Return
5 – Output
I
N R
T
N D
C
+ R
T
N O
U
T
1 2 3 4 5
Figure 6–5 External I/O Loopback Test Connections
If the External I/O loopback test fails, the pattern shown in Figure 6–4 will be
displayed on the LEDs. Check the connections shown in Figure 6–5 and retest.
If the test continues to fail, return the unit for repair.