Troubleshooting, Section 4, To section 5 – Siemens ISOLATED MULTI-DROP SG-6048-01 User Manual
Page 14: 5 troubleshooting
5
Troubleshooting
Siemens Energy & Automation, Inc.
11
5 Troubleshooting
If you experience communications errors and suspect the
Isolated Multi-Drop converter is at fault, perform the actions
listed below. Before performing these tests:
1.
Verify that your application software is properly set up.
2.
Verify that the cables between the components are
connected correctly according to the installation
instructions.
If transmission through the Isolated Multi-Drop converter
fails (one or more of the Tx LEDs fails to blink), perform the
following checks in the order given:
1.
If some (but not all four) of the Tx LEDs blink
simultaneously, the Isolated Multi-Drop converter is
faulty and should be replaced.
2.
If none of the Tx LEDs flash, perform the following
steps in order:
a.
Check the power connection and verify that the
PWR LED is lit.
b.
Verify that the Tx Control switches are set
according to the specifications of your application
software.
c.
Verify that the PC’s serial port is working properly. If
it is, try replacing the cable to the converter.
If data errors occur or if there is no response from the field
devices (Rx LED fails to flash), perform the following checks
in the order given:
1.
If correct data is transmitted from a field device but
communication errors occur or no Rx LED flashes,
check the following:
a.
Verify that the field device is receiving power.
b.
Verify that the cable from the converter to the field
device is correct.
c.
Verify that the device’s communications address
matches the address assigned by the software for
that device.
d.
Verify that the device’s data rate matches that of
the software.
2.
Verify proper operation of the attached field device’s
RS-485 communication interface. For more detailed
troubleshooting information on field devices, refer to
troubleshooting guidelines in Installing the ACCESS
System (Manual No. SG-6028).
3.
Verify that the Data(+) and Data(-) port of each device is
connected to the corresponding ports of the converter.