α2 Simple Application Controllers |
Dedicated Protocol Error Diagnostics 8 |
8.Dedicated Protocol Error Diagnostics
The α2 controller has a number of Diagnostic messages in both the controller and the VLS software.
8.1Check points for Dedicated Protocol
Table 8.1: Dedicated Protocol Hardware and Communication Checks
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Error |
Check Points |
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Check that the wiring connections are properly made |
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PC COM port is used in another application. Shut down other applications. |
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An α2 COM port is used in another application. Shut down other |
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applications. |
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No communication is |
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The “Other” setting has not been made in the α2 main body or the VLS |
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possible |
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software. |
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Power has not been cycled after choosing the “Other” setting. |
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Switching between programming protocol and dedicated protocol will cause |
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the PLC and PC to stop communicating. |
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Check that the Check Sum calculation is correct. |
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Check that the wiring connections are properly made. |
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Sum Check Error (01H) |
Check that the pin assignments are correct on the user-made cross-cable. |
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Check that considerations have been made for noise sources. |
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Check that the wiring connections are properly made. |
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Protocol Error (02H) |
Check that the pin assignments are correct on the user-made cross-cable. |
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Check that considerations have been made for noise sources. |
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Check that the commands for READ, WRITE, or RUN/STOP are correct. |
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Check that the Device Status setting value is within the intended device’s |
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Device Error (03H) |
range. |
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Check that the Write Protect for the memory cassette is not enabled. |
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Remote Error (04H) |
Check the controller program for errors. |
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Date/Time Error(05H) |
Check the Date and Time for errors. |
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8 - 1
α2 Simple Application Controllers |
Dedicated Protocol Error Diagnostics 8 |
MEMO
8 - 2
α2 Simple Application Controllers
HEAD OFFICE: MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100-8310 HIMEJI WORKS: 840, CHIYODA CHO, HIMEJI, JAPAN
JY992D97701D |
Effective August. 2005 |
(MEE) |
Specifications are subject to change without notice. |