ABB Pluto Safety PLC Maintenance and Troubleshooting

Relay output contact capacity: AC-1/AC-15 250 V/1.5 A, DC-13 24 V/1.5 A.

If the output load exceeds the rated value, the internal protection will turn off the output and the Error LED will light up.

Equipment replacement and configuration migration

When Pluto units need to be replaced due to hardware failures or upgrades, they cannot be simply plugged in or unplugged, and consistency in program, address, and bus configuration must be considered.

6.1 Replace with the same model (without bus or bus model)

Record original configuration: Connect online through Pluto Manager and upload project files (. plp or. pl7). If communication is not possible, backup files need to be used.

Set up a new unit:

Install the new Pluto IDFIX (if any) to its original location.

If using IDFIX ROG, the program can be directly copied to the new unit.

Download program: Connect the new Pluto through a programming cable to download the project.

Verify I/O: manually trigger each safety input, observe the corresponding output action, and use Pluto Manager's online monitoring function to check the status.

6.2 Upgrade to different models (e.g. S20 → B20)

Due to possible variations in the number and types of I/O, it is important to note that:

I/O mapping adjustment: The IQ10-IQ17 of the original S20 may need to be remapped to the corresponding terminals of the new model.

Dynamic signal configuration: Retain the original signal type settings.

Bus address: If the original system uses a bus, the node address of the new Pluto must be consistent with IDFIX or software settings.

Program compatibility: Pluto Manager automatically checks if the feature block supports new hardware. It is recommended to compile and correct errors in offline mode first.

6.3 Using IDFIX ROG for Program Backup and Recovery

IDFIX ROG is a program storage device specifically designed for single Pluto systems. The steps are as follows:

Backup: Connect the IDFIX ROG to Pluto's ID terminal and 0V, and the program will automatically write to the IDFIX ROG after power on.

Recovery: Connect IDFIX ROG to the new Pluto, and the program will automatically write to the new unit after power on.

This method does not require a computer and is very suitable for quick on-site replacement.

6.4 Replacing Gateway (GATE Series)

The Pluto gateway (GATE-P2/D2/C2/E2) is used for communication with PROFIBUS, DeviceNet, CANopen, Ethernet, and other devices. Attention should be paid when replacing:

DIP switch settings: Node address, baud rate, etc. must be consistent with the original gateway.

Firmware version: Some gateways (such as GATE-E2) support web server configuration, and the IP address needs to be reset.

Bus filtering settings: If the original gateway has enabled bus bridging and filtering functions, it needs to be reconfigured on the new gateway.

Gateway integration and bus bridging

7.1 Overview of Gateway Models

Characteristics of Model Protocol

GATE-P2 PROFIBUS DP-V0 automatic detection baud rate (≤ 12 Mbit/s), address DIP switch (0-99)

GATE-D2 DeviceNet supports ODVA 2.0 and can serve as a CAN bridge to filter bus data

GATE-C2 CANopen complies with CiA DS-301 and can serve as a CAN bridge

GATE-E2 EtherNet/IP, PROFINET, Modbus TCP built-in web server, 10/100 Mbit/s

7.2 Data exchange capability

From Pluto to the higher-level PLC: Access Pluto's I/O and global variables (GM). Each gateway has a maximum of 64 Boolean values and 8 16 bit registers.

From the higher-level PLC to Pluto: Non safety control data can be written, and it also supports 64 Boolean values and 8 registers.

ABB provides functional blocks for mainstream PLCs (Siemens, Rockwell, etc.) to simplify integration.

7.3 Bus Bridge Function (GATE-D2/C2)

When the Pluto bus distance exceeds 600 meters or segmented isolation is required, the gateway can be configured as a bridge:

Two gateways are connected back-to-back (from one bus segment to another).

The built-in filter can prevent unwanted data from crossing bridges, reduce bus load, and allow for longer distances.

Security encoder application

Pluto combined with RSA 698 absolute encoder can achieve safe position and speed monitoring, suitable for robots, gantry frames, eccentric presses, etc.

Safe Encoder function block: reads an encoder and outputs position and velocity values. Node address and range need to be configured.

Safe Encoder Multiturn: Read two encoders, calculate the average, and monitor the difference (MaxDiff ≤ 2%). Output position and speed.

Encoder Cam function block: activates output Q based on position value, and can set minimum/maximum limits (supports crossing zero points).

Wiring: The encoder is directly connected to the Pluto bus, with a maximum of 16 encoders. Each encoder has a unique node address (set through DIP switches or software).

Common Problems and Maintenance Suggestions

Possible causes and solutions for the phenomenon

After Pluto is powered on, the Error LED stays on. The program is lost or there is a hardware failure. Download the program again; Check the power supply voltage; Replace unit

7-segment display of "E" or digital flashing bus communication error check for repeated terminal resistance, cable connection, and node address