Maple Systems OIT Family - Manual (Page 122)

When the PLC Requests the Same Screen Twice the Screen is
Not Displayed
Possible Cause:
• If the MRR already contained the screen number that the PLC requested, the OIT would
not recognize the screen request.
Possible Solution:
• Modify the PLC program so that when the MRR already contains the screen number that
the PLC is requesting, the PLC writes a zero to the MRR before writing the screen number.
• If using an OIT3100 and OIT4100 Series, activate the Clear Register/Bit After Receiving
Screen Request feature. Refer to the Configuring the MRR with Enhanced Features
section in CHAPTER 5: Displaying Stored Screens.
OITware-200
PC Displays “Out of Memory” When Starting OITware-200
Possible Cause:
• The computer does not have sufficient resources to run OITware-200.
Possible Solution:
• Use a computer that has at least 4MB of RAM.
OITware-200 Displays “Timeout Detected. OIT did not respond.”
Possible Causes:
• The OIT is not connected to the PC or is not in Download/Upload Mode.
• OITware-200 is not using the correct COM port.
• The configuration cable is not wired correctly.
• The configuration cable is not connected to the correct port on the OIT or the PC.
• If your OIT has two serial ports, something is connected to the RTS/CTS lines on port 1.
Possible Solutions:
• Verify that the configuration cable is wired correctly and is in good condition.
• Follow the steps in the Downloading an OITware-200 Project section in CHAPTER 1:
Getting Started.
• Ifyour OIThas two serialports,verifynothingis connectedto the RTS/CTSlines onport1.
OIT to PLC Communication
OIT Displays “Cannot Connect To PLC During Startup.
*** Reconnect in progress ***” or
“Can’t connect to PLC. Retry in Progress!”
Possible Causes:
• The PLC’s mode switch is not in the correct position.
• The PLC password in the OIT does not match the PLC.
• The communication settings (baud rate, parity, data bits, stop bits) for the OIT and PLC do
not match.
• The communication cable is not wired correctly.
• The communication cable is not connected to the correct port on the OIT or PLC.
• The wrong PLC protocol was downloaded to the OIT
Troubleshooting 122
1010-0099, Rev. 07