Process automation protocols include PROFIBUS, DeviceNet, ControlNet, Modbus, and CIP. These protocols are used to connect control devices together, be it a PLC to a sensor, a PLC to a PLC, or an engineering workstation to a control device to configure or program the device:
These protocols tend to be found mostly in levels 3 and lower of the Purdue model. A properly configured IDMZ should block any process automation protocol from leaving the Industrial zone.
From a security perspective, these protocols were never designed with security in mind. They forgo using encryption or implementing integrity checks to provide ...
