#PLC communication
69 articles tagged with #PLC communication. This page is set to noindex per SEO configuration.
Modbus TCP Beckhoff TwinCAT: Client and Server Setup
Modbus TCP Beckhoff TwinCAT configuration with TF6250: client function blocks, server XML mapping, licensing by TwinCAT version, and the usual failure points.
Modbus TCP CODESYS: Step-by-Step Configuration
Modbus TCP CODESYS configuration for WAGO, Phoenix Contact, ABB, and Delta PLCs: master and slave setup, channel configuration, and vendor-specific notes.
Modbus TCP ControlLogix Setup in Studio 5000
Modbus TCP ControlLogix setup three ways: the ProSoft MVI56E-MNETC module, AOI socket messaging, and a gateway, with pitfalls and performance notes for each.
Modbus to MQTT: How the Gateway Bridge Works
Modbus to MQTT explained: how a gateway maps registers to topics, builds JSON payloads, and handles reads, writes, QoS and TLS. With a worked example.
Modbus Parity and Character Format
Modbus parity and character format: data bits, parity, and stop bits for RTU and ASCII, the even-parity default, the two-stop-bit rule, and what parity misses.
Modbus Unit Identifier Explained: Unit ID by Scenario
Modbus Unit Identifier (Unit ID) explained by scenario: direct TCP devices, RTU gateways, multi-port gateways. Value ranges, common defaults, troubleshooting.
Modbus Broadcast Function Codes: Address 0 Explained
Modbus broadcast on address 0: which function codes support it, how serial and TCP differ, turnaround timing, gateway behavior, and when to actually use it.
Modbus Client-Server vs Master-Slave Terminology
Modbus client-server vs master-slave: the 2020 terminology change explained. What stays the same, translation table, and how to read mixed-terminology docs.
Modbus TCP MBAP Header Explained: 7 Bytes Byte by Byte
Modbus TCP MBAP header decoded byte by byte: Transaction ID, Protocol ID, Length, and Unit ID, with a real hex dump, network byte order, and common mistakes.
Modbus TCP Security Explained: TLS on Port 802
Modbus TCP Security explained: TLS on port 802, X.509 certificates, role-based access control, deployment alongside port 502, cipher suites, real setup.
Modbus Byte Order and Word Order: Fix Your 32-Bit Values
Modbus byte order and word order decoded: ABCD, CDAB, BADC, and DCBA. Fix reversed floats and byte-swapped longs, with a five-minute test and vendor defaults.
Allen-Bradley EtherNet/IP: CIP Configuration Guide
Allen-Bradley EtherNet/IP setup on ControlLogix and CompactLogix: implicit vs explicit messaging, Generic Ethernet Module, MSG instructions, and fault codes.
CIP Security Explained: TLS, X.509, and OT Cybersecurity
CIP Security architecture: TLS for TCP 44818, DTLS for UDP 2222, X.509 certificates, device authentication, trust models, EST provisioning, IEC 62443 alignment.
EtherNet/IP vs Modbus TCP: Complete Comparison Guide
EtherNet/IP vs Modbus TCP: detailed comparison of data models, performance, ports, security, deployment scenarios. When to choose which protocol.
CIP Device Profiles Guide: Interoperability Framework
CIP device profiles explained: how Device Type codes define interoperability. Complete profile catalog (AC Drive 0x02, Discrete I/O 0x07, Encoder 0x22, more).
CIP Motion Explained (Class 0x42 Motion Axis Object)
CIP Motion explained: distributed motion control over EtherNet/IP. Motion Axis Object (Class 0x42), control modes, CIP Sync dependency, servo drive integration.
CIP Sync Explained: IEEE 1588 PTP for Industrial Networks
CIP Sync explained: IEEE 1588 PTP for CIP networks. Time Sync Object (Class 0x43), grandmaster/boundary clocks, Best Master Clock Algorithm, offset clock model.
CIP Path Segments Explained: EPATH Encoding for Engineers
Complete guide to CIP path segments: Port, Logical, Network, Symbolic, Data segments. Decode 20 04 24 66, EPATH format, Electronic Key segment, padded vs packed.