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Guard I/O Introduction
Control and monitor your safety devices with Guard I/O. When used with Rockwell Automation safety controllers, Guard I/O communicates on EtherNet/IP or DeviceNet using CIP Safety protocol. As a proven technology, Guard I/O will detect failures at the I/O and field device level, while enhancing operator protection. Guard I/O are block I/O modules that include the communications adapter and either 8 or 16 points of safety I/O in a single package.
Guard I/O modules on DeviceNet are available in both IP20 (cabinet mount) and IP67 (on-machine) form-factors and Guard I/O modules on EtherNet/IP are available in IP20 form factors.
Guard I/O modules offer the following advantages when implementing a safety control system:
- Reduced engineering — Onboard, Guard I/O has self-diagnostics, hardware testing, and field circuit testing (short-circuit, wire break, discrepancy) with no additional programming required.
- Cost-reduced hardware options — Increases ability to safely shutdown an application without additional safety relays.
- Space-savings — Monitor and control more safety devices using less panel space.
- Use of existing network infrastructures — Connect to standard and safety I/O over one DeviceNet or EtherNet/IP network.
- Flexibility and easy migration to EtherNet/IP — The same Guard I/O modules for both DeviceNet and EtherNet/IP networks lets you re-use engineering designs.
- Highest safety level — TÜV-certified up to SIL 3/Category 4.
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| CompactBlock Guard I/O Modules | ArmorBlock Guard I/O Modules | |
| Description | Cost-effective block I/O for use in an enclosure. | Cost-effective block I/O with IP67 protection for use on the machine. |
| Digital Safety Inputs | Up to 16 channels | Up to 8 channels |
| Digital Safety Outputs | Up to 8 channels | Up to 4 channels |
| Safety Relays | Up to 4 channels | No |
| High Current Capacity Outputs | Up to 2 amps per channel | Up to 2 amps per channel |
| Use in Hazardous Areas | UL Listed for Class I, Division 2 Group A,B,C,D | No |
| DeviceNet | ||
| Interface Module | 1756-DNB, 1753-DNSI, 1752 | 1756-DNB, 1753-DNSI, 1752 |
| Bulletin Number | 1791DS | 1732DS |
| EtherNet/IP | ||
| Interface Module | 1756-ENBT, 1756-EN2T, 1756-EN2F | Not available |
| Bulletin Number | 1791ES | Not available |
Common Guard I/O Module features:
- Integrated pulse test outputs for testing safety circuitry like e-stops and gate switches, for use in applications up to Category 4. These outputs can also be used independently for standard output control or voltage source to sensors.
- Safety outputs, with integrated pulse testing for use in applications up to Category 4.
- Ability to detect at each I/O point:
- short-circuit to 24V dc or 0V
- wire breakage
- discrepancy of dual channel circuitry, due to mechanical alignment or a failure
- short-circuit to 24V dc or 0V
- All Guard I/O modules have common circuit functionality, operation, programming, troubleshooting, and diagnostics.
- Built in diagnostic LEDs for I/O circuitry and power status.
- I/O point status available to any controller.
- EDS file or Logix 5000 profile compatible.
- Removable and keyed terminal blocks.
- Common power and I/O wiring across Guard I/O modules on DeviceNet and EtherNet/IP networks (1791DS-IB16/1791ES-IB16 and 1791DS-IB8XOBV4/1791ES-IB8XOBV4).
- Safety input power source separate from safety output power source.
- Removable and insertable under power, when following appropriate safety practices.
- Electronic overcurrent protection of all outputs.