PACSystems RX7i CPUs are programmed and configured using dedicated programming software to perform real-time control of machines, processes, and material handling systems.

The CPU communicates with I/O and intelligent option modules via a rack-mounted backplane compliant with the VME64 standard. Communication with programming workstations and HMI devices is provided through embedded Ethernet ports or a serial interface using the SNP Slave protocol.

Key Features
Memory and Data Handling

User memory:

10 MB battery-backed RAM

10 MB non-volatile Flash memory

Bulk memory access via reference table %W

Configurable allocation of data and program memory

Battery-backed real-time calendar clock

Programming Capabilities

Supports programming in:

Ladder Diagram (LD)

Structured Text (ST)

Function Block Diagram (FBD)

C language

Auto-located Symbolic Variables, using any amount of available user memory

Supports up to 512 program blocks

Maximum block size: 128 KB

Test Edit mode allows online testing of logic changes without stopping the CPU

Bit-in-word referencing supported

In-system firmware upgrades supported

Reference Memory Capacity

Discrete I/O:

32 Kbits for %I (inputs)

32 Kbits for %Q (outputs)

Analog I/O:

Up to 32 K words each for %AI and %AQ

Module Compatibility

Supports Series 90-70:

Discrete I/O modules

Analog I/O modules

Communication and specialty modules

Supports all VME modules compatible with Series 90-70

For a complete list of supported modules, refer to the
PACSystems RX7i Installation Manual (GFK-2223)

Communication Interfaces
Serial Communication

Three isolated serial ports:

1 × RS-485

1 × RS-232

1 × RS-232 Ethernet Station Manager port

Embedded Ethernet Interface

The built-in Ethernet interface provides comprehensive networking and diagnostics capabilities, including:

Ethernet Global Data (EGD) for real-time data exchange

SRTP TCP/IP communication services

Support for:

SRTP Channels

Modbus/TCP Server

Modbus/TCP Client

Full programming and configuration services over Ethernet

Comprehensive station management and diagnostic tools

Supports RX7i web-based data monitoring

Up to 16 total web server and FTP connections

Ethernet Hardware Features

Two full-duplex 10Base-T / 100Base-TX (RJ-45) ports

Internal managed Ethernet switch with:

Auto-negotiated speed

Duplex mode selection

Automatic crossover detection

User-configurable Redundant IP address

SNTP time synchronization with Ethernet time servers

Available when using CPU firmware Release 5.00 or later

Typical Applications

PACSystems RX7i CPUs are well suited for large-scale and high-performance automation systems, including:

Machine automation and material handling

Continuous and batch process control

Power generation and distribution

Oil, gas, and petrochemical processing

Manufacturing systems requiring high availability and deterministic control