Table 2-6 Event Byte Types - Siemens SIMATIC TI505 User Manual

Modbus Function Descriptions (continued)
2-32 Modbus Commands
Event Byte
Slave Bus Receive. Byte
stored on receipt of message
Slave Bus Transmit. Byte
stored when message sent
Entered Listen Only
Mode. Byte stored when
LOM mode entered
Initiate Communications
RESET. Complete log is set
to zeros.

Table 2-6 Event Byte Types

Bit Definitions
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
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
Bit 0 – 0
Bit 1 – 0
Bit 2 – 1
Bit 3 – 0
Bit 4 – 0
Bit 5 – 0
Bit 6 – 0
Bit 7 – 0
Bit 0 – 0
Bit 1 – 0
Bit 2 – 0
Bit 3 – 0
Bit 4 – 0
Bit 5 – 0
SIMATIC TI505/TI500 MODNIM User Manual