General Information

Library Overview

The PLCCommunication library provides functions for the management of explicit data exchanges between controller and devices through Modbus or ASCII protocols.

Characteristics of the Library

The table indicates the characteristics of the library:

Characteristic	Value
Library title	PLCCommunication
Company	Schneider Electric
Category	Communication
Component	Core Repository
Default namespace	SEN
Referencing method	Via placeholder SE_PLCCommunication
Language model attribute	-
Forward compatible library	Yes FCL

Controller Platforms

The PLCCommunication library is supported by the following controller platforms:

Harmony SCU HMI Controller
Modicon M241 Logic Controller
Modicon M251 Logic Controller
Modicon M262 Logic/Motion Controller

General Considerations

NOTE: Schneider Electric adheres to industry best practices in the development and implementation of control systems. This includes a "Defense-in-Depth" approach to secure an Industrial Control System. This approach places the controllers behind one or more firewalls to restrict access to authorized personnel and protocols only.

WARNING
	UNAUTHENTICATED ACCESS AND SUBSEQUENT UNAUTHORIZED MACHINE OPERATION Evaluate whether your environment or your machines are connected to your critical infrastructure and, if so, take appropriate steps in terms of prevention, based on Defense-in-Depth, before connecting the automation system to any network. Limit the number of devices connected to a network to the minimum necessary. Isolate your industrial network from other networks inside your company. Protect any network against unintended access by using firewalls, VPN, or other, proven security measures. Monitor activities within your systems. Prevent subject devices from direct access or direct link by unauthorized parties or unauthenticated actions. Prepare a recovery plan including backup of your system and process information. Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING

UNAUTHENTICATED ACCESS AND SUBSEQUENT UNAUTHORIZED MACHINE OPERATION

Evaluate whether your environment or your machines are connected to your critical infrastructure and, if so, take appropriate steps in terms of prevention, based on Defense-in-Depth, before connecting the automation system to any network.
Limit the number of devices connected to a network to the minimum necessary.
Isolate your industrial network from other networks inside your company.
Protect any network against unintended access by using firewalls, VPN, or other, proven security measures.
Monitor activities within your systems.
Prevent subject devices from direct access or direct link by unauthorized parties or unauthenticated actions.
Prepare a recovery plan including backup of your system and process information.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

For more information on organizational measures and rules covering access to infrastructures, refer to ISO/IEC 27000 series, Common Criteria for Information Technology Security Evaluation, ISO/IEC 15408, IEC 62351, ISA/IEC 62443, NIST Cybersecurity Framework, Information Security Forum - Standard of Good Practice for Information Security and refer to Cybersecurity Guidelines for EcoStruxure Machine Expert, Modicon and PacDrive Controllers and Associated Equipment.