Quick Sizing & Sourcing Snapshot
- Manufacturer: GE Fanuc (Emerson Automation Solutions)
- Part Number: IC695PBM300
- System Platform: PACSystems RX3i (Series 90-30 compatible)
- Hardware Type: PROFIBUS DP Master Communication Module
- Architectural Role: Occupies a single slot in an RX3i rack to act as the Class 1 DP Master, managing the token pass, polling up to 125 slaves, and exchanging cyclic I/O data via the backplane with the CPU.
- Key Specifications: 125 Slaves, 12 Mbps, 244 Bytes I/O per Slave, DP-V1 Support.
System Architecture & Operational Principle
The sits at Purdue Level 2, occupying a standard I/O slot in a PACSystems RX3i rack (Universal Backplane). It is the interface between the RX3i CPU (e.g., IC695CPE330) and a PROFIBUS DP field network.
Upstream, it connects to the CPU via the RX3i PCI Backplane. The CPU exchanges I/O data images (Input/Output tables) with the PBM300 using CommReq instructions or direct memory mapping. Configuration (Baud rate, Slave addresses, GSD assignments) is downloaded from Proficy Machine Edition (PME) to the module’s non-volatile memory.
Internal Processing, it runs an onboard stack managing the PROFIBUS Token Ring. It holds the token, polls slaves cyclically (DP-V0), and handles acyclic services like DP-V1 Read/Write and Alarms. It supports Sync and Freeze modes for coordinated motion/data capture.
Downstream, it drives the RS-485 bus via a 9-pin D-Sub (Female) connector on the front. This connects to the PROFIBUS cable (Shielded Twisted Pair). It can control up to 125 Slave devices (e.g., VFDs, Remote I/O heads, Valves), each supporting up to 244 bytes of Input and 244 bytes of Output data (3,584 total bytes per direction). It requires the RX3i CPU to be at firmware version 2.9 or higher.
Core Technical Specifications
- Protocol: PROFIBUS DP (Supports DP-V0, DP-V1)
- Connector: 1x 9-pin D-Sub (Female, RS-485)
- Slave Capacity: 125 Devices (Max)
- Data Capacity: 244 Bytes In / 244 Bytes Out per Slave (3,584 Total)
- Baud Rates: 9.6 kbps to 12 Mbps (9 Standard Rates)
- Power Draw: 440 mA @ 3.3 V DC (Backplane Sourced)
- Isolation: 1500 V DC (Bus to Backplane)
- Indicators: PROFIBUS OK (Green), NETWORK (Bi-color), MOD STATUS (Bi-color)
- Config Storage: Non-Volatile (Retains config through power loss)
- Firmware Update: Via CPU using WinLoader utility
- Hot-Swap: Yes (In supported redundant configurations/non-haz loc)
- Operating Temp: 0°C to +60°C
