Yokogawa JUXTA M Series Digital Limit Alarms MVTK Instrukcja Użytkownika Pobierz pdf (Strona 58)

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IM 77J04J11-01E 1st Edition : 2006.08.25-00

5.2.2 Response Error Codes

● Message Format in the Event of Error

If there are any inconsistencies other than communication errors in a message, the M

Series does nothing, but returns the following message.

Number of bytes in RTU mode

Number of bytes in ASCII mode 2

Address

Number

(ADR)

Element Function Code

(*1)

Error Code Error Check [CR] [LF]

None

*1: In this case, a value of [function code (hexadecimal number) + number 80 (hexadecimal number)] is set.

● Response Error Codes

Table 5-3 List of Error Codes

Error Code Meaning Cause

02 D-register number error

Function code error

03 D-register count error

Specified D register number is out of the range.

No such function code exists.

Specified number of D registers is out of the range.

● Even when a message is sent, no response returns if:

• Retransmission error (overrun, framing, parity, LRC, or CRC-16 error) was detected.

• Address in a command message is incorrect.

• Interval between data composing a message was 2 seconds or more.

• CRC-16 or LRC values are incorrect.

• Broadcase is specified (address number: 00).

Note: As a countermeasure, provide a timeout process in the communication functions of a higher-level device or in the

communication program.

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Yokogawa JUXTA M Series Digital Limit Alarms MVTK Instrukcja Użytkownika Strona 58