ICP DAS USA GW-7552-B User Manual page 34

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
●
I/O Safe Mode：Retain last value/Switch safe value
●
Byte Order : Little-Endian/Big-Endian
●
Output Data Mode : Manual/Auto
●
Modbus Device ID(S)：1~247
●
Polling Modbus Device Interval(ms) (M)：1~65535ms
●
Query Message Timeout Value(ms)(M)：1~65535ms
●
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-7552-B / GW-7552-M acts as a Modbus master (Modbus
Type=Master):
i. Data exchange between Profibus master and GW-7552-B / GW-7552-M is
interrupted
"I/O Safe Mode" will be activated when the data exchange between
Profibus master and GW-7552-B / GW-7552-M is interrupted (e.g. no
physical connection, Profibus master leaves the data exchange mode, etc.).
 I/O safe mode = "Switch Safe Value"
The GW-7552-B / GW-7552-M 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-7552-B / GW-7552-M is
interrupted
 I/O safe mode = "Switch Safe Value"
The GW-7552-B / GW-7552-M 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"
GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual (Version 1.60, May/2017) PAGE: 34