User manual

Chapter 6 Diagnostics
Elpro_man_105g_1.18.doc Page 150
6.4.5 DeviceNet Indicating LED’s
Led No Colour State Description
1 - - Reserved for future use
2 - Off Not powered / Not online
2 Green Steady Link OK, On line, Connected
2 Green Flashing On line, Not connected
2 Red Flashing Connection timeout
2 Red Steady Critical link failure
2 Green/Red Flashing Power on self-test.
3 - Off No power to device
3 Green Steady Device operational
3 Green Flashing Data size bigger than configured
3 Red Flashing Minor fault
3 Red Steady Unrecoverable fault
3 Green/Red Flashing Power on self-test.
4 - - Reserved for future use
6.5 Radio Path Testing
To carry out a radio path test, you will need two 105U modules. One module will be “fixed” and
the other “mobile”. Both units will need power supplies and antennas. The power supply for the
mobile unit is normally a 12V battery, but make sure that the battery is fully charged - batteries
with low voltage will lead to low radio power which will affect the test result.
The object of the test is to determine whether radio paths are reliable, marginal or unreliable. A
reliable path will have a margin of at least 10dB above the background noise level in good
weather - this margin is enough to ensure that the radio path remains reliable in poor conditions.
A marginal path will work reliably in good conditions; however will fail during poor conditions.
If the test is carried out during rainy or foggy weather, then a margin of only 5dB is required.
Procedure:
 Configure the modules to the same system address, and on each module, configure DI1 to
DO2 on the other module. At the fixed module, wire DO2 to DI1 such that DI1 will turn
ON when DO2 turns ON. Connect a switch to DI1 on the mobile unit.
 When the modules are close to each other, test the system - close the switch, forcing the
mobile unit to transmit. The mobile unit will transmit to the fixed unit, and the fixed unit
will transmit back to the mobile unit, activating DO2. Turning off the switch will result in