Allen Bradley Guardmaster Security Practice

Installation and wiring specifications

4.1 Mechanical Installation

All Guardmaster relays are designed for 35mm DIN rail installation with a panel protection level of IP20. Ensure that the heat dissipation space is at least 50mm above and below during installation.

Environmental temperature range: -10 ° C~+55 ° C (GSR), -20 ° C~+60 ° C (440C-CR30), avoid approaching high-power heating elements.

4.2 Power Wiring

Power supply voltage: 24V DC (± 20%), power consumption varies depending on the model (typical value 2-5W).

SELV/PELV certified power supply must be used, and 0V must be grounded (to prevent floating ground interference).

For 440C-CR30, an external 120/240V AC power module is also available as an option.

Important reminder: Multiple safety relays can share the same 24V power supply, but it is necessary to ensure that the power capacity is sufficient (total power does not exceed the rated value) and install a fast fuse (2A recommended).

4.3 Input circuit wiring

The GSR series typically offers two or three secure input channels (such as S11-S12, S21-S22, etc.). Wiring method:

Single channel (not recommended for high security level): using only one normally open contact, suitable for secondary protection that does not require redundancy.

Dual channel (standard): Using two independent normally open contacts (or a pair of normally open+normally closed), Cat.3/4 can be achieved.

Dual channel with short circuit detection: It is necessary to connect the two wires of the input circuit to the corresponding detection terminals (for example, S11 and S12 are not short circuited, but are connected to the two ends of the emergency stop contact), and use auxiliary terminals to detect the jumper short circuit. This wiring method has strict limitations on cable resistance (usually<10 Ω), otherwise it may trigger incorrectly.

Common wiring errors:

Sharing the normally open contacts of the dual channels on one COM terminal resulted in the inability to detect short circuits between the two channels.

The external reset button (S33-S34) was not connected, resulting in the device being unable to restart (if configured for monitored startup, manual reset is required).

4.4 Output Circuit Wiring

The safety output contacts are usually labeled as 13-14, 23-24, 33-34, etc., and the contact rating is generally 6A (240V AC) or 5A (24V DC).

For inductive loads (contactor coils, solenoid valves), surge suppressors (such as RC absorption circuits or freewheeling diodes) must be connected in parallel at both ends of the contacts, otherwise it will seriously shorten the contact life and generate electromagnetic interference.

To prevent contact fusion welding, the output circuit should be connected in series with fuses of appropriate specifications (slow melting 6A or fast melting 10A is recommended).

4.5 Description of Multi functional Terminals for 440C-CR30

The terminals of 440C-CR30 are configurable:

Dedicated input (10 points): 24V DC leakage type input, used for standard safety input.

Multi functional terminal (2-point): can be configured as input, single wire safety input, or test output.

Multi functional terminal (6 points): can be configured as input, test output, or safety output (24V DC source type).

Dedicated output (2-point): 24V DC source type output, used to directly drive contactors or indicator lights.

Multi functional output (2 points): can be configured as standard output or single line safe output (SWO).

This flexibility allows a module to handle multiple applications, but the terminal functions must be configured correctly during programming, otherwise it may lead to the failure of safety functions.

Integration with EtherNet/IP: Detailed explanation for using 440R-ENETR

5.1 Hardware Connection

Connect 440R-ENETR to an industrial Ethernet switch (or directly connect to a controller) via RJ45 interface.

Connect ENETR and up to 6 Guardmaster GSR relays (such as 440R-D22R2, etc.) using optical bus cables. The optical bus adopts a dedicated plug, with a maximum transmission distance of about 10 meters.

Power supply: 24V DC.

5.2 Network Configuration

Assign a fixed IP address to ENETR through BOOTP/DHCP servers or using Rockwell's BOOTP-DHCP tool.

Add the EDS file of ENETR module in RSLogix 5000/Studio 5000 and add it as Generic Ethernet Module to the I/O configuration.

Data Mapping: As an adapter, ENETR's input/output data instance size depends on the number and type of GSRs connected. Each GSR relay will occupy a certain amount of bytes of status information (such as channel status, fault codes, contact positions, etc.).

In PLC programs, these status words can be read to monitor the operation status of safety relays and generate diagnostic alarms.

5.3 Common Network Malfunctions and Troubleshooting

Possible causes and solutions for the fault phenomenon

ENETR is not communicating, MS/NS light is flashing red, IP address conflict and network fault are detected. Check network cables, use Ping command to test, and reassign IP addresses

ENETR can ping, but PLC cannot establish connection. EDS file version mismatch, instance size error. Reinstall EDS file and check input/output data length (usually 1-20 bytes)