Siemens SIMATIC TI505 Manual de usuario descargar pdf (Pagina 62)

Modbus Commands

2-31

SIMATIC TI505/TI500 MODNIM User Manual

Code

12 returns the same information as Function Code 1

1 plus a message

count and an additional 64-event byte. This means that a 2-byte status

word, a 2-byte event counter

, a message count, and the most recent 64

events are returned. A buffer records each send or receive operation and

overwrites the oldest event with the latest event. No events are recorded for

this code or Code 1

1. The Event Byte types are shown in T

able 2-6.

Example:

Request: 10 0C XXXX

Checksum (XXXX)

Function code 12 (0C hex)

Slave address (10)

Figure 2-25 Get

Comms Event Log Example — Request

This request to address 16 (decimal) is for the Exception Event Log.

10 0C 46 0000 0204 020B C0 00 XXXX

Checksum (XXXX)

2nd latest event (00)

Latest event (C0)

Message count (020B)

Event count (0204)

Status word (0000)

Byte count (46)

Function code 12 (0C hex)

Slave address (10)

Response:

Figure 2-26 Get

Comms Event Log Example — Response

The response has returned 70 bytes of data (2 status bytes + 2 event counter

bytes + 2 message counts + 64 event bytes). Only two of the event bytes are

shown; these indicate the secondary node was reset (00) and then received a

broadcast message (C0). The most recent events are returned first.

Code 12 — Get

Comms Event Log

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 90 91

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Siemens SIMATIC TI505 Manual de usuario Pagina 62