3BDH000364R0002 PM783FB0 process control module

Although the controller has encountered a problem, the watchdog alarm output has not yet been powered. If problem persists, the LED will become lit constantly, see case #2. The controller performs a warm start. If it happens only once, the controller has performed a restart. If, however, it happens multiple times, then there is an application or hardware problem (see case #2).

► Try powering down and then powering up the XCL8010. 

► If problem persists, check and – if necessary – reload the application.

 ► If problem still persists, replace hardware.

I/O Modules Troubleshooting

 ► Check if the power supply voltage level is OK and that there is no high voltage (> 24 VAC or > 40 VDC) connected to the inputs/outputs of the …821, …822, …823 I/O modules.

 ► Replace the problem I/O module with another module of the same kind. – If the problem persists, this is an indication that the problem is caused by the application or incorrect wiring. – If the problem is solved, this is an indication that the I/O module was defective. 

For troubleshooting purposes, the following features can be used: • Power LED (all Excel 800 I/O modules) • Service LED (all Excel 800 I/O modules) 

• Service button (pluggable I/O modules, only) In addition, a module-specific troubleshooting may be necessary.

LONWORKS Bus I/O modules:

 ► Replace hardware.

 Panel Bus I/O modules: ► Set the hex address to the position configured with CARE 

► Ensure that I/O Bus switch S2 of XCL8010 Controller is set to position "Panel" 

► Check the Panel Bus wiring: - Check for cable breaks - Check for cable short-circuits - If using separate transformers: Check ground connection

 ► Eliminate any mixture of Panel Bus I/Os and LonWorks I/Os on same wire ► Allow XCL8010 to configure I/O module

 ► Unplug and replug the module

 ► If problem persists, replace hardware