Commonly also referred to as Industrial Control Systems (ICS), which is not accurate but closeĥ Where is SCADA? Power Generation/Transmission Water Treatment/Distribution Pipelines Traffic Control Systems Manufacturing Facilities National Infrastructure Communicationsħ What is ModScan? ModScan is a tool to detect open MODBUS/TCP ports and identify device Slave IDs associated with IP addresses ModScan is designed for an administrator or security auditor to be able to accurately reconnoiter a MODBUS/TCP networkĨ The MODBUS Protocol About the Protocol Developed in 1979 by Modicon Free and Open Source The most common protocol found in SCADA and ICS networks Default port 503 Flavors Modbus RTU - Compact Binary Modbus ASCII - Human readableĩ MODBUS Packet Construction 256 byte max ADU Slave ID Fn Code Data Error Chk 1 byte 1 byte 252 byte max 2 bytes ADU: Application Data Unit PDU PDU: Protocol Data Unit Valid Function codes are byte maximum packet size Big-Endian encoding Error Check is CRC/LRCġ0 Typical Communication Master Slave Initiate Request SID Fn Data Ec Execute Command Initiate Response SID Fn Data Ec Receive Response Modbus is a Master/Slave Serial Protocol Only Masters can initiate conversationġ1 Error Communication Master Slave Initiate Request SID Fn Data Ec Error Detected Report Error SID EFn Error Code Ec Receive Error Error Function = 0x80 + Function Code Error Codes defined in specificationġ2 Function Codes Function Code Description 01 Read Coils 02 Read Discretes 03 Read Holding Registers 04 Read Input Registers 05 Write Coil 06 Write Register 07 Read Exception Status 08 Diagnostics 0B Get Comm Event Counter 0C Get Comm Event Log 0F Write Multiple Coils 10 Write Multiple Registers 11 Report Slave ID 14 Read File Record 15 Write File Record 16 Mask Write Register 17 Read/Write Multiple Registers 18 Read FIFO Queġ3 Diagnostic Codes Function Code Description 00 Return Query Data 01 Restart Communication 02 Return Diagnostic Register 03 Change ASCII Input Delimiter 04 Force Listen Only Mode Reserved 0A Clear Counters and Diagnostic Reg. I apologise for the bug which blocked CMD-A (add register) from working.1 ModScan A SCADA MODBUS Network Scanner Mark BristowĢ Agenda Brief introduction to SCADA Systems The MODBUS Protocol MODBUS TCP ModScan Demonstration ModScan Project Information Q&Aģ Disclaimer The material in this presentation is to be used for authorized security scanning/ auditing If you do something stupid with the information I present here, don t blame meĤ What is SCADA? Supervisory Control And Data Acquisition is a system that centrally gathers data in real time from local and remote locations in order to control equipment and conditions. mbs file that holds the register settings if that information was provided. The help tool is nicely done, but is of little value, at least with regard to my needs. However, it’s basically worthless to me unless someone can tell me how to create the additional registers I need to simulate the device for which I’m writing an interface. The server does start up and responds to inquiries. I can’t even create and load 8 holding registers. There appears to be no way to (easily?) create and load 8 input registers. After downloading and trying Modbus Server (free) and learning it does not work in 10.11.3, I read the info on the Pro version and it indicates it works “10.6 or later.” So, I spent the $3.99 and have wasted a ton of time (and $3.99) trying to figure out how to create 8 input registers.
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