SRCI - Standard Robot Command Interface

SRCI (Standard Robot Command Interface) is an open standard for programming and operating robots from a PLC. It uses a client-server remote procedure call model: a client on the PLC sends command messages to a server/interpreter on the robot controller, which executes the command and returns a response. Communication is fieldbus-agnostic and can be implemented over PROFINET or other fieldbuses.

Source checked2/2 values · 2026-10-25

Specification

1 source

Transports	other
Architecture	client server
Encoding	binary

Study notes

SRCI standardizes communication between the robot controller and the PLC.
The server is called the interpreter and resides on the robot controller; the client runs on the PLC.
SRCI specifies over 119 commands, including basic move commands such as linear movements and force control.
A function must be supported by both the server and the client to be used.
Commands are grouped into Profile Core, Profile Extended, and optional commands.
Profile Core provides basic commands and core functionality; every broad-release SRCI implementation supports at least Profile Core commands.
Profile Extended and optional commands can be added individually by manufacturers; availability is listed in the SRCI Vendor Map.
SRCI provides robot commands as function blocks in PLC engineering tools.
PROFINET isochronous mode is not necessary for SRCI.
The SRCI Vendor Map lists products supporting SRCI and function availability down to supported parameter values.