This document describes how to configure a 1769-SM2 module to communicate with Modbus RTU slave devices over an RS485 network. It explains how to set the configuration mode switch and configuration data table to define the communication parameters for up to 31 slave devices per channel. Logic is provided for reading holding register data from the slave devices using function codes, register addresses, and data lengths specific to each device. Notes are included on checking slave status and parameters using third-party software. References for the module manual and RS485 connector pinout are also listed.
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DMC, a Siemens Solution Partner with the most S7 Certified Engineers in the United States, recently shared some insights to people new to Siemens to help avoid common mistakes at the 2011 Siemens Automation Summit. Over the years we have encountered numerous applications written by novices and seen first-hand some of the more common errors made.
InduSoft offers a native DNP3 driver for electrical applications. In our upcoming webinar, we would like to demonstrate the way InduSoft Web Studio communicates with the DNP3 protocol commonly used in the electrical industry. Join us for the webinar to learn how you can make better HMI/SCADA applications, or facilitate communication between RTUs and IEDs using InduSoft Web Studio’s native DNP3 driver.
DMC, a Siemens Solution Partner with the most S7 Certified Engineers in the United States, recently shared some insights to people new to Siemens to help avoid common mistakes at the 2011 Siemens Automation Summit. Over the years we have encountered numerous applications written by novices and seen first-hand some of the more common errors made.
Learn the capabilities and features of EtherNet/IP, including
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Like its predecessor PROFIBUS, PROFINET is a diagnostic-rich protocol allowing your support team to quickly identify the source of device-related problems. This however is of limited use if the underlying performance of your network is poor. PROFINET networks are often seen as the plug and play solution for industrial networks, giving you the impression that successful completion of your application-specific testing is a guarantee that your network is working efficiently and without errors. This is fundamentally wrong and needs to be considered at the design stage as well as the acceptance stage of a project. This presentation will discuss the issues, how to address them and give typical examples of the equipment required.
Learn the capabilities and features of EtherNet/IP, including
an overview of networking technology and terminology.
Learn how the Common Industrial Protocol (CIP) fully uses the
Open Systems Interconnection (OSI) reference model and the
value of supporting standard Ethernet and Internet Protocol (IP)
network technology.
Ladder logic on Soft-Master Honeywell PLC ML50Shivam Singh
How to create logic gates using ladder logic, how to create program for holding & interlocking, how to use memory addresses in programming, push button as toggle switch, how to use timers in ml-50 , how to use counters in ml-50, how to use compare blocks, how to use move instruction, how to use arithmetic and conversion instructions, y = {(x-xmin)(ymax-ymin)/(xmax-xmin)}+ymin, how to set io parameters by system architecture, how to create manual logic.
Like its predecessor PROFIBUS, PROFINET is a diagnostic-rich protocol allowing your support team to quickly identify the source of device-related problems. This however is of limited use if the underlying performance of your network is poor. PROFINET networks are often seen as the plug and play solution for industrial networks, giving you the impression that successful completion of your application-specific testing is a guarantee that your network is working efficiently and without errors. This is fundamentally wrong and needs to be considered at the design stage as well as the acceptance stage of a project. This presentation will discuss the issues, how to address them and give typical examples of the equipment required.
RS-232 is a popular communications interface for connecting modems and data acquisition devices (i.e. GPS receivers, electronic balances, data loggers, ...) to computers.
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3. Setting the Configuration Mode Switch in 1769 SM2 Module
Before installing the module, make sure its Configuration Mode Switch is correctly set.
SW1 Setting Description SW2 Setting
CONT (Controller) Default setting—The 1769-SM2 module uses the configuration
Single Position (For Single drive per
back position data downloaded from the controller on power-up and when the
channel)
controller is placed in run mode.
Multi-Drive Position (For Max 5
PARAM (Parameter) The 1769-SM2 module uses its internal parameter settings to
drives per channel or up 31 RTU
front position configure the module.
slave devices per channel)
Select SW1 in Controller Position and SW2 in Multi-Drive Position.
8. Configuration and Logic
Use these data values to configure the configuration data table of SM2 module.
For DSI I/O Config Select “5” for modbus RTU slave.
RTU Baud Rate Configuration RTU Format Configuration
Where The RTU format
consists of three
components: data bits (8 data
bits only), parity
(None, Even or Odd), and stop
bits (1 or 2).
e.g.: For None parity and 2 stop bits select value “3”.
e.g.: For baud rate 9600 bits/sec select value “2”.
For RTU Rx Delay, RTU Tx Delay And RTU MSG Timeout select the values according to
the load in controller and scan time of controller in such a way that the slave device
has sufficient time to respond to the master.
12. Logic for reading
Holding Register data of RTU Devices Configuration and Logic
Refer to Notes
13. Notes
Slave Device ID: Can be configure for each slave device. (0-255)
Function Code: Can be differ according to the register type.(Such as 3-Holding Register, 4-Input Register)
To See Example
Register Address and Length: May vary according to the slave device’s parameters.
Click Here
( For PCS Controller: Register Address is “3” and its data length is “1”.)
Please select the proper data mentioned above for slave devices otherwise communication fails.
For detailed information about these parameters please refer to the user manual of the particular slave
device.
To check slave communication status and device parameters: use ModScan32 (3rd party software) if
available.
AK-U0-RJ45-TB2P (RJ45 – RS485 Connector) Pin Out:
14. References
1769 SM 2 Module User Manual
http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1769-um013_-en-p.pdf