Delta DVP-ES2 User Manual download pdf (Page 608)

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DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

Exception response:

The PLC is expected to return a normal response after receiving command messages from the master

device. The following table depicts the conditions that either a no response or an error response is

replied to the master device.

1. The PLC did not receive a valid message due to a communication error; thus the PLC has no

response. The master device will eventually process a timeout condition.

2. The PLC receives a valid message without a communication error, but cannot accommodate it,

an exception response will return to the master device. In the exception response, the most

significant bit of the original command code is set to 1, and an exception code explaining the

condition that caused the exception is returned.

An example of exception response of command code 01H and exception 02H:

Sent message:

Field Name ASCII Hex

STX : 3A

Slave Address 01 30 31

Command code 01 30 31

Starting Address Hi 04 30 34

Starting Address Lo 00 30 30

Number of Points Hi 00 30 30

Number of Points Lo 10 31 30

Error Check (LRC) EA 45 41

END CR LF 0D 0A

Feedback message:

Field Name ASCII Hex

STX : 3A

Slave Address 01 30 31

Function 81 38 31

Exception Code 02 30 32

Error Check (LRC) 7C 37 43

END CR LF 0D 0A

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