Eaton Electrical D77A Communication Hints, Status LED Description Explanation, Problem Solution

Intelligent Technologies (IT.) D77A I/O Module Products

Table 31: Status LED

Status LED	Description	Explanation
Mostly Off	Offline	Everything is OK with in the I/O Module and the I/O Module is not being scanned.
		Check that the Network Adapter is commanded to scan QCPort. This is generally done by setting bit 0 of byte
		0, for channel A, in the output assembly.
Mostly On	Online	Everything is OK with in the I/O Module and the I/O Module is being scanned.
50%	Faulted	Internal memory fault (cycle power).
		Verify that there are not any duplicate Group ID’s (address). Check that the address is unique for the QCPort
		system.
		The Group ID was changed and a reset is required.
		Buss fault. All the devices on the QCPort will have the same status LED behavior. A buss fault is caused by an
		open or QCPort shorted buss.
Rapid Flash	Unacquired	The I/O Module has not been discovered/acquired by the Network Adapter, verify that the node ID is set
		correctly for the system.
		The Network Adapter has not auto configured the QCPort system. In this case all the I/O Module’s will have
		the same behavior of the status LED. Perform an auto configuration.
		CH Studio is identifying that device. When the device is highlighted in CH Studio this is a way to identify in
		the field which device is being highlighted. Remove the highlight from CH Studio and verify that the Rapid
		Flash disappears.
Solid On		It is possible the I/O Module is in firmware download mode, cycle power to exit that mode. If the LED stays
		solid On after the power cycle, it is possible that the I/O Module has in internal failure and will need to be
		replaced.
Off	No Power	The I/O Module is not powered or a memory fault in NV RAM has occurred that will require the I/O Module to
		be replaced.

Communication Hints

Table 32: Communication Hints

Problem	Solution
Are all the QCPort devices	Check the Network Adapter, is the ST LED Green? – If the LED is green, then perform an auto configuration of
connected to one Network	the Network Adapter and see if the problem goes away.
Gateway are not
	There may be a damaged I/O Module or a shorted QCPort communication wire that is prohibiting QCPort
communicating? Are all the
	communications. Remove all the I/O Modules from the QCPort system.
Status LED’s either Rapid
Flash or 50% On	Unplug the Network Adapter from the industrial network.
	Cycle power to the Network Adapter.
	One by one plug the I/O Modules back in and verify that the status LED is mostly off as they are plugged back in.
	When the I/O Module the causes the system to fail is plugged in, the I/O Module’s status LED will rapid flash or
	50% flash only.
	Remove the I/O Module and check the QCPort connections for shorted or damaged wires or connections.
	When all the I/O Modules are online, plug the Network Adapter into the industrial Network.
	It is possible that the terminating resistors are damaged, replace the terminating resistors.
Is there a single I/O Module	The problem may be that the I/O Module has a fixable internal communication failure. Perform a reset by
in the system that is not	toggling the rotary switch from 0 to 1 five times, reset the rotary switch to the correct group ID (address).
communicating?
	It is also possible the Group ID rotary switch was changed after auto configuration. Check the rotary switch and
	verify that they are in the correct position for that address. Physically move the rotary switch from one position
	to another to verify that it is in the correct position (there will be a “snap” when it reaches the next state).
	Unplug and replug the device and check that the problem disappears.
	It is possible that the communication connections are damaged or unplugged.
	It is possible that the terminating resistors are damaged, replace the terminating resistors.
During auto configuration	Check the status LEDs on the I/O Module units, if the LEDs are rapid flashing or 50% On refer to the above
the Network Adapter will not	problem for a solution.
detect any of the I/O
	If the status LEDs on the I/O Module units are all slow flashing, the Network Adapter has already connected to
Modules.
	the I/O Module units and the problem is that the CH Studio software is not displaying the I/O Module units. This
	can be because the scanner is not allowing CH Studio to send long messages.
	The Network Adapter cannot perform an auto configuration if the system controller is scanning the Network
	Adapter. Disconnect the Network Adapter from the industrial network and reattempt the auto configuration.
MN05002001E	For more information visit: www.EatonElectrical.com	47