Siemens SIMATIC TI505 Bedienungsanleitung PDF herunterladen (Seite 63)

Modbus Commands

2-32

SIMATIC TI505/TI500 MODNIM User Manual

Modbus Function Descriptions (continued)

able 2-6

Event

Byte T

ypes

Event Byte Bit Definitions

Slave Bus Receive. Byte

stored on receipt of message

Bit 0 – Reserved

Bit 1 – Set if communications error

Bit 2 – Reserved

Bit 3 – Reserved

Bit 4 – Set if character overrun

Bit 5 – Set if in Listen Only mode

Bit 6 – Set if Broadcast

Bit 7 – 1

Slave Bus Transmit. Byte

stored when message sent

Bit 0 – Set if an exception (1–3) is sent

Bit 1 – Set if secondary abort exception (6) is sent

Bit 2 – Set if secondary busy exception (6) is sent

Bit 3 – Not used

Bit 4 – Set if write timeout occurred

Bit 5 – Set if in Listen Only mode

Bit 6 – 1

Bit 7 – 0

Entered Listen Only

Mode. Byte stored when

LOM mode entered

Bit 0 – 0

Bit 1 – 0

Bit 2 – 1

Bit 3 – 0

Bit 4 – 0

Bit 5 – 0

Bit 6 – 0

Bit 7 – 0

Initiate Communications

RESET. Complete log is set

to zeros.

Bit 0 – 0

Bit 1 – 0

Bit 2 – 0

Bit 3 – 0

Bit 4 – 0

Bit 5 – 0

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 90 91

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