Eaton Electrical D77A user manual Renewal Parts, Communication Troubleshooting Hints

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

Troubleshooting

Table 28: Troubleshooting

Observation	Possible Cause/Corrective Action
The input LED will not illuminate.	Verify that the module is powered; the LED is controlled by the micro controller
	in the device.
	The power for the input itself may not be applied. Verify that there is a valid
	signal on the input point.
	The screws on the terminal may be loose; tighten the screws.
	Replace the device.
The output LED is illuminated but the output is not on.	Check that the switch closes on the output using a multi meter.
	The screws on the terminal may be loose; tighten the screws.
	Replace the device.
The status LED has a “fast blink” while all other device’s	The “fast blink” device may have the same Group ID as another device. Verify
status LEDs are “mostly on.” See Table 26 Status LED.	that all devices have unique Group IDs.
	The “fast blink” device was not accepted into the scan list. Reasons include it
	was replaced and the device is not the same as the original device (parameters
	are different or the product is different).
	An out-of-box device was inserted into an actively scanning QCPort; power will
	need to be cycled on QCPort to be accepted.
While On-Line with CH Studio the I/O Module disappears.	It may be that the controller is not allowing enough time for the CH Studio
	messages and the connection between CH Studio and the Network Adapter is
	timing out. You may have to take the system controller off-line to continue or
	add an interscan delay to the industrial network scan.
While looking at the I/O Module it is noticed that the status	If no other LED’s are on it is possible the I/O Module was placed into a firmware
LED is solid on.	download mode, cycle power to the I/O Module and see if the LED behaves
	properly.
	The module may have corrupt memory or damage to the circuit board and the
	module will need to be replaced.
Renewal Parts
Table 29: I/O Module Renewal Parts
Description			Part Number
7-Position QCPort Backplane			D77E-BP7
12-Position QCPort Backplane			D77E-BP12
25-Position QCPort Backplane			D77E-BP20
QCPort RJ Terminator			D77E-TERRJ
25 cm Powered QCPort Interconnect			D77E-QPIP25
1 Meter QCPort Interconnect			D77E-QPIP100
2 Meter QCPort Interconnect			D77E-QPIP200
3 Meter QCPort Interconnect			D77E-QPIP300
QCPort Terminator and Power Tap			D77E-QPLR
Communication Troubleshooting Hints
Explanation of LED Duty Cycle States
Table 30: Explanation of LED Duty Cycle States
LED Duty Cycle State		Explanation
Mostly Off		One short blink ON every 2 seconds
Mostly On		One short blink OFF every 2 seconds
50%		ON and OFF blinking same amount of time; 1/2 second cycle
Rapid Flash		Strobe

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