Mitsubishi QJ71MB91 User Manual page 323

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TROUBLESHOOTING
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* 1 The NAK count defined by the MODBUS protocol is stored in the Received NAK count.
Note that this count is different from the NAK LED on the QJ71MB91.
* 2 It does not count when the request message is sent by the MBREQ instruction.
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11.3 Checking the Communication Status of QJ71MB91
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