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Coils from a Modicon field device, such as a PLC, RTU, or IED, can be
read using function code 1.
Using function code 1, Modbus can reads the coils in a Modbus slave,
which is commonly used by SCADA and DCS field devices. Coils refer
to the binary output settings and are typically mapped to actuators.
A sample of coil settings read from the device are provided by the
The ability to read coils may help an attacker profile a system and
identify ranges of registers to alter via a write coil message.
See also :
Restrict access to the Modbus port (TCP/502) to authorized Modbus
Risk factor :
Medium / CVSS Base Score : 5.0
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