ICP DAS USA GW-7553-B User manual

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 1
GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway
User's Manual
High Quality, Industrial Data Acquisition, and Control Products
Warranty
All products manufactured by ICP DAS are under warranty regarding
defective materials for a period of one year from the date of delivery to the
original purchaser.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 2
Warning
ICP DAS assumes no liability for damages resulting from the use of this
product. ICP DAS reserves the right to change this manual at any time
without notice. The information furnished by ICP DAS is believed to be
accurate and reliable. However, no responsibility is assumed by ICP DAS
for its use, or for any infringements of patents or other right of third parties
resulting from its use.
Copyright
Copyright 2013 by ICP DAS. All rights are reserved.
Trademark
The names used for identification only may be registered trademarks of
their respective companies.
List of Revision
Date
Author
Version
Revision
2012/05/10
Ryan
1.33
Release
2013/05/30
Elliot
1.34
Release
2017/05/15
Eric
1.35
Add GW-7553-M
information.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 3
Table of Contents
1. Introduction 4
1.1 Features 5
1.2 Modules Support 5
1.3 Specification 5
2. Hardware 7
2.1 Block Diagram of GW-7553-B / GW-7553-M 7
2.2 Pin Assignment 7
2.3 Wiring 9
2.4 Setting the PROFIBUS Address 12
2.5 LED status indicator 14
2.6 Normal/Setting DIP switch 15
3. Communication protocol transfer theorem 17
3.1 PROFIBUS data exchange 17
3.2 Modbus data exchange 20
3.3 Communication protocol transfer 23
3.4 PROFIBUS DP-V1 Acyclic Service 28
4. Communication 32
4.1 Field of application 32
4.2 GSD file 33
4.3 The Configuration of the common parameters 35
4.4 The Configuration of the modules 38
4.5 Diagnostic messages 40
4.6 I/O data exchange 42
4.7 Establish connection with GW-7553-B / GW-7553-M 45
4.8 Data exchange example—Modbus RTU 46
4.9 Data exchange example—Modbus TCP 56
5. Application of Utility 93
5.1 Install Utility 93
5.2 Utility introduction 96
5.3 Memory address configuration of the module 98
5.4 Safe value setting 101
5.5 IP setting 103
5.6 Establish connection with GW-7553-B / GW-7553-M 104
6. Configuration with Web Browser 108
6.1 Connecting to Web Server 108
6.2 Web Configuration—Function menu 109
6.3 Web Configuration—Setup page 110
7. Troubleshooting 118
8. Dimensions 120

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 4
1. Introduction
PROFIBUS and Modbus are two kinds of famous protocols and are wildly used in
the fields of factory and process automation. The GW-7553-B / GW-7553-M is a
PROFIBUS to Modbus TCP gateway. By using this module, users can easily put the
Modbus TCP devices into PROFIBUS network.
Figure 1 shows an application example for the GW-7553-B / GW-7553-M module.
Figure 1 Application architecture of the GW-7553-B / GW-7553-M module
The GW-7553-B / GW-7553-M Gateway is specially designed for the slave device of
PROFIBUS DP protocol. In the Modbus protocol application, the GW-7553-B / GW-
7553-M can be a Modbus Master device or Slave device. The Modbus devices can
exchange data with the PROFIBUS Master device via the GW-7553-B / GW-7553-M
module.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 5
The main features and specification of GW-7553-B / GW-7553-M are described as
below:
1.1 Features
●16-bit Microprocessor inside with 80MHz
●Profichip VPC3+C PROFIBUS controller
●Support PROFIBUS DP-V0 & DP-V1 slave
●PROFIBUS transmission rate detect automatically
●Max transmission speed up to 12 Mbps for PROFIBUS and 115.2 kbps for
COM Port
●Support Modbus RTU, ASCII and TCP format
●Support Modbus Master/Slave mode
●Support safe value setting
●COM Port driver has 1K bytes QUEUE input buffer & 512 bytes QUEUE
output buffer
●Max length of output/input data is 240/240 Bytes
●Ethernet Port: 10/100 Base-TX
●2500Vrms High Speed iCoupler Isolation Protection for PROFIBUS network
●3000VDC Isolation Protection on the PROFIBUS side
●Provide LED indicators
●Built-in Watchdog
●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
1.3Specification

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 6
COM Port specs:
●Serial port - RS-232
●Serial port interface: screw terminal block
●Baud Rate：2400/4800/9600/19200/38400/57600/115200 bps
●Data Format: 7/8 data bits, None/Odd/Even parity bit, 1/2 stop bit
PROFIBUS specs:
●PROFIBUS interface connector: D-Sub 9-pin female
●Baud Rate: 9.6k/19.2k/45.45k/93.75k/187.5k/500k/1.5M/3M/6M/12Mbps
●Address Setting: 0~126 (set by DIP switch or EEPROM)
Ethernet specs:
●10/100Base-TX (Auto-negotiating, Auto_MDIX, LED indicator)
Power requirement:
●Unregulated +10 ~ +30 VDC
●Power reverse protection, Over-Voltage brown-out protection
●Power consumption 2.5W
Module specs:
●Dimensions:
GW-7553-B : 119mm X 72mm X 33 mm
GW-7553-M :118mm X 102mm X 27 mm
●Operating temperature: -25 ~ 75 ºC
●Storage temperature: -30 ~ 85 ºC
●Humidity：5 ~ 95% RH, non-condensing
●LED Status Indicators(Table 2)
Table 2 LED status indicator
PWR LED
Show the power state
Show data state
ERR LED
Show error state
RUN LED
Show communication state of PROFIBUS

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 7
2. Hardware
2.1 Block Diagram of GW-7553-B / GW-7553-M
Figure 2 Block diagram of GW-7553-B / GW-7553-M
2.2 Pin Assignment

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 8
Figure 3 Pin assignment of GW-7553-B / GW-7553-M
Table 3 9-pin screw terminal block
Pin
Name
Description
1
CTS
Clear to Send of RS-232
2
RTS
Request to Send of RS-232
3
RX
Receive Data of RS-232
4
TX
Transmit Data of RS-232
5
GND
GND of RS-232
6
-
N/A
7
-
N/A
8
+VS
V+ of Power Supply(+10 ~ +30 VDC)
9
GND
GND of Power Supply
Table 4 RJ-45 socket

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 9
Table 5 PROFIBUS DB9 Female Connector
Pin
Name
Description
1
-
N/A
2
-
N/A
3
B
Non-inverting Bus Line
4
ISODE
Isolated DE output for use in PROFIBUS
applications where the state of the isolated drive
enable node needs to be monitored.
5
GND
Power supply ground for the first node and the last
node
6
VP
+5V Power Supply for the first node and the last
node
7
-
N/A
8
A
Inverting Bus Line
9
-
N/A
2.3 Wiring
GW-7553-B / GW-7553-M supports PROFIBUS to Serial or Ethernet
communication. It is recommended to use only one communication interface (RS-
232 or Ethernet) of the Gateway at the same time. The following section describes
the connection interface of GW-7553-B / GW-7553-M.
2.3.1 RS-232 connection
Pin
Name
Description
1
TX+
TX+ output
2
TX-
TX- output
3
RX+
RX+ input
4
-
N/A
5
-
N/A
6
RX-
RX- input
7
-
N/A
8
-
N/A

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 10
The RS-232 port of the GW-7553-B / GW-7553-M has got three pins. The
wiring of the RS-232 device with the RS-232 port of the GW-7553-B / GW-
7553-M is shown in Figure 4.
Figure 4 RS-232 wiring diagram
2.3.2 Ethernet connection
The user can connect GW-7553-B / GW-7553-M with the other device to the
same sub network or same Ethernet Switch, as shown in Figure 5.
Figure 5 Ethernet connection

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 11
2.3.3PROFIBUS Connection
The PROFIBUS interface of the GW-7553-B / GW-7553-M is a DB9 female
connector. The connector uses the standard PROFIBUS 9 pin assignment. It is
recommended to use a standard PROFIBUS cable and connector (DB9 male).
As with every serial bus the rate of safe data transmission in a PROFIBUS
network decreases with increasing distance between Master and Slave. Table 6
shows the transmission rate and range for a cable with the following properties:
1. Impedance :135~165 Ω
2. Capacity : lower than 30 pF/m
3. Loop resistance : lower than 110 Ω/km
4. Wire diameter : greater than 0.65 mm
5. Core cross-section : greater than 0.34 mm2
Table 6 Transmission rate decreasing with increasing transmission distance
Transmission Rate(kbps)
Transmission Distance per Segment (meter)
9.6, 19.2, 45.45,93.75
1200
187.5
1000
500
400
1500
200
3000, 6000, 12000
100
In order to minimize the reflection effect of signal transmission, both ends (first
node and last node) of a PROFIBUS segment needs to be equipped with an
active terminal resistor as shown in Figure 6. A standard PROFIBUS connector
is usually already equipped with a terminal resistor. The user therefore only has
to switch on the resistor of the devices stationed at the ends of a segment as
shown in Figure 7.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 12
Figure 6 PROFIBUS connection
Figure 7 PROFIBUS connector
The number of stations in a PROFIBUS network is restricted to 126. According
to the PROFIBUS specification up to 32 stations are allowed per segment. A
repeater has to be used to link the bus segments.
2.4 Setting the PROFIBUS Address
The station address of GW-7553-B / GW-7553-M can be set by using either the

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 13
DIP switch or by writing it directly to the EEPROM. The DIP switch covers a
range from 0 to 255. The valid address range of a PROFIBUS station spans from 0
to 126. Table 7 shows three examples of setting the station address by using the
DIP switch. The DIP switches are accessed by opening the modules housing
(Figure 8). Table 8 explains which address will be used by the module after
power on, if the DIP switch address setting differs from the address stored in the
EEPROM.
Table 7 DIP switch setting example
Station address
DIP switch (SW1)
1
2
3
4
5
6
7
8
1
1
0
0
0
0
0
0
0
10
0
1
0
1
0
0
0
0
126
0
1
1
1
1
1
1
0
Note: 1=>ON, 0=>OFF
Table 8 The Address setting of the GW-7553-B / GW-7553-M
DIP switch Setting
Description
0~125
1. The address setting of the EEPROM is ignored.
2. The address can not be set by the PROFIBUS configuration
tool.
126-254
1. The address setting of the DIP switch is ignored.
2. If the address in the EEPROM is 126, the PROFIBUS
configuration tool can set a new address and save it to the
EEPROM.
255
1. Slave address in the EEPROM is set to 126.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 14
Figure 8 DIP switch
Each Slave must have a unique valid address (1 to 125) in order to be able to
communicate with the Master. To change the address by using the configuration
tool it is necessary to first set the address stored in the EEPROM to 126. This is
done by setting the DIP switch to 255 in the power off state. Switching the
module on is forcing the module to change its address in the EEROM to 126. In
the next step switch the module off and change the DIP switch setting to any
value from 126 to 254. This step is necessary in order to prevent the module to
change its address in the EEPROM to 126 every time it is powered on. The
configuration tool can now assign the Slave a new address.
2.5LED status indicator
The GW-7553-B / GW-7553-M provides three LEDs to indicate the statuses of
the GW-7553-B / GW-7553-M module. The position of LEDs and descriptions
are shown in Table 9 and Figure 9.
Table 9 LED status description
LED Name
Status
Description
PWR
flash
When the GW-7553-B / GW-7553-M acts as a
Modbus Slave device and receiving query message
form Modbus Master device, PWR led will flash.
on
Power supply is ok.
The firmware has loaded.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 15
LED Name
Status
Description
off
Power supply has failed.
ERR
flash
When the GW-7553-B / GW-7553-M connects with
the utility tool, it will flash fast (flash once about
55ms).
When the GW-7553-B / GW-7553-M has diagnostic
message, it will flash slowly (flash once about 220ms).
on
Connection error between PROFIBUS Master and
Slave or
PROFIBUS system has not been configured
correctly.
off
Normal operation
PROFIBUS system has been configured correctly
RUN
on
Data exchange mode
Normal operation.
off
GW-7553-B / GW-7553-M module is not in a data
exchange mode.
Figure 9 LED position
2.6Normal/Setting DIP switch
There is a DIP switch on the back of the GW-7553-B module, as shown in Figure 10.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 16
The DIP switch is used to set the GW-7553-B module works in operation mode or
setting mode. In the normal situation, it needs to set the DIP switch to the “Normal”
position. In this case, the GW-7553-B module can communicate with Modbus devices.
When the user sets the DIP switch to the “Setting”position, the GW-7553-B module
can communicate with the utility to set the safe value and network configuration.
GW-7553-M module only can connect to Utility via setting the control bit (please
refer section 4.6.2 Output data area and communication command) to enable the
setting mode of the GW-7553-M.
Figure 10 DIP switch of the GW-7553-B
PS:
There are two kinds of methods to enable the setting mode of the GW-7553-B.
The user can change the position of the DIP switch or set the control bit (please refer
section 4.6.2 Output data area and communication command) to enable the setting
mode of the GW-7553-B, as shown in Table 10 .
Table 10 Mode of GW-7553-B
Mode
SM(control bit)=0
SM(control bit)=1
DIP switch=Normal
operation mode
setting mode
DIP switch =Setting
setting mode
setting mode

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 17
3. Communication protocol transfer theorem
3.1 PROFIBUS data exchange
The GW-7553-B / GW-7553-M is a PROFIBUS DP Slave device. The GW-7553-
B / GW-7553-M is first parameterized then configured and finally it goes into the
data exchange mode (Figure 11).
Figure 11 State machine of PROFIBUS DP Slave device
The GW-7553-B / GW-7553-M exchanges data cyclically between internal DI、
DO、AI、AO data and PROFIBUS Master device in data exchange mode, as
shown in Figure 12.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 18
Figure 12 Data exchange between PROFIBUS Master device and GW-7553-B /
GW-7553-M
The GW-7553-B / GW-7553-M downloads the parameter and configuration from
PROFIBUS Master device to be the module parameters. The GW-7553-B / GW-
7553-M and PROFIBUS Master device have different data type and data address,
the GW-7553-B / GW-7553-M can transfer different data format to PROFIBUS
Master device through module parameters. When the GW-7553-B / GW-7553-M
acts as a Modbus Master device, it will send DI、AI data to input data area of
PROFIBUS Master device and it will save data that receives from PROFIBUS
Master device to internal DO、AO memory space, as shown in Figure 13 、
Figure 14.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 19
Figure 13 The output data of PROFIBUS Master device send to the GW-7553-B /
GW-7553-M
Figure 14 The input data of PROFIBUS Master device receive from the GW-7553-B /
GW-7553-M
When the GW-7553-B / GW-7553-M acts as a Modbus Slave device, it will send
DO、AO data to input data area of PROFIBUS Master device and it will save data
that receives from PROFIBUS Master device to internal DI、AI memory space, as
shown in Figure 15 、 Figure 16.

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual (Version 1.35, May/2017)
PAGE: 20
Figure 15 The output data of PROFIBUS Master device send to the GW-7553-B /
GW-7553-M
Figure 16 The input data of PROFIBUS Master device receive from the GW-7553-
B / GW-7553-M
3.2 Modbus data exchange
Modbus protocol belongs to Master-Slave communication and it uses query and
response message to arrive at data exchange and device control, as shown in