GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual
(Version 1.60, May/2017)
PAGE: 5
The main features and specification of GW-7552-B / GW-7552-M are described as
below:
1.1 Features
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16-Bit Microprocessor inside with 80MHz
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Siemens SPC3 PROFIBUS controller
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Supports PROFIBUS DP-V0 slave
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PROFIBUS transmission rate detect automatically
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Max transmission speed up to 12M bps for PROFIBUS and 115.2K bps for
COM Port
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Supports Modbus RTU/ASCII format
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Supports Modbus master/slave mode
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Supports safe value setting
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COM Port driver has 1K bytes QUEUE input buffer & 512 bytes QUEUE
output buffer
Max length of output/input data is 131/132 Bytes
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Built-in self-tuner ASIC controller on RS-422/485 port
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2500Vrms High Speed iCoupler Isolation Protection for PROFIBUS network
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3000VDC Isolation Protection on the PROFIBUS side
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Provide LED indicators
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Built-in Watchdog
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Mountable on DIN Rail
1.2 Modules Support
Only the following Modbus commands are supported by the gateway.
Table 1: Modbus function codes
Code
Name
Description
01
Read Coil Status
Read the ON/OFF status of discrete outputs in the slave
02
Read Input Status
Read the ON/OFF status of discrete inputs in the slave
03
Read Holding Registers Read the binary contents of holding registers in the slave
04
Read Input Registers
Read the binary contents of input registers in the slave
05
Force Single Coil
Write a single output to either ON or OFF in the slave
06
Preset Single Register
Write an integer value into a single register in the slave
15
Force Multi. Coils
Write each coil in the sequence of coils to either ON or
OFF in the slave
16
Preset Multi. Registers
Write a block of contiguous registers in the slave
1.3 Specification