B&B Electronics GW-7553 - Manual - Manual (Page 30)

GW-7553 PROFIBUS/Modbus TCP Gateway User Manual (Version 1.00, Dec/2008) PAGE: 30
4.3 The Configuration of the common parameters
GW-7553 has twelve common parameters. The user can configure the common
parameters to set the communication mode and data format by the PROFIBUS
configuration tool. The common parameters are described below.
●
COM Port baud rate：2400/4800/9600/19200/38400/57600/115200
●
COM Port parity：None/Even/Odd
●
COM Port data length：7/8 data bit
●
COM Port stop bit：1/2 stop bit
●
Modbus Type：Master/Slave
●
Modbus Format：RTU/ASCII/TCP
●
I/O Safe Mode：Retain last value/Switch safe value
●
Byte Order : Little-Endian/Big-Endian
●
Modbus Device ID(S)：1~247
●
Polling Modbus Device Interval(ms) (M)：1~65535ms
●
Query Message Timeout Value(ms)(M)：1~65535ms
●
TCP_Connect_Num(T)(M)：1~8
PS：
a. When stop bit of COM Port is 2, data bit of COM Port must be 7 or else stop bit
of COM Port will be set to 1.
b. I/O Safe Mode
When GW-7553 acts as a Modbus Master (Modbus Type=Master):
i. Data exchange between PROFIBUS Master and GW-7553 is interrupted
“I/O Safe Mode” will be activated when the data exchange between
PROFIBUS Master and GW-7553 is interrupted (e.g. no physical
connection, PROFIBUS Master leaves the data exchange mode, etc.).
• I/O safe mode = “Switch Safe Value”
The GW-7553 will set internal DIO and AIO data to safe value and
send the safe values to the Modbus Slave device.
• I/O safe mode = “Retain Last Value”
Internal DIO and AIO data retain last value
ii. Connection between Modbus Slave and the GW-7553 is interrupted
• I/O safe mode = “Switch Safe Value”
The GW-7553 will set the internal DI and AI data to safe value and send
safe values to PROFIBUS Master device.
• I/O safe mode = “Retain Last Value”
Internal DIO and AIO data retain last value