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P/N 69761 rev. B
1
Banner Engineering Corp.
•
Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
PICO-GUARD Controller
Instruction Manual
Figure 1-1. PICO-GUARD System Overview
1. System Overview
1.1 Description
The Banner PICO-GUARD fiber optic safety system is a
diverse-redundant microprocessor-controlled optoelectronic
guarding system. This system consists of a controller, flexible
optical fiber, protective sheathing and optical elements (fiber
optic interlock switches, beams and grids). The system can be
used with various combinations of optical elements using the
four independent optical channels.
The controller also has electrical Universal Safety Stop
Interface (USSI) inputs that can connect to other safeguards,
E-stop devices, process controls or actuators. Regardless of
the combination of optical elements and external safeguards
used, when the system detects an interruption of an optical
path or receives a safety stop request, it will provide a stop
signal to the machine control circuit. The machine control
circuit then reacts to protect personnel from hazards, or to
protect equipment, critical tooling, or critical materials in
process.
The controller has two solid-state diverse-redundant safety
outputs (OSSDs) to control 24V dc loads. If an ac-powered
MPCE or other load is required, an accessory interface module
or redundant positive-guided contactors may be used to
convert the PICO-GUARD outputs to isolated, forced-guided
relay contacts (e.g., model IM-T-9A or IM-T-11A, see Section
2.3 for more information.)
The OSSD (Output Signal Switching Device) safety outputs
are capable of performing a “handshake” communication with
the Muteable Safety Stop Interface (MSSI) or Universal Safety
Stop Interface (USSI) found on other Banner Engineering
safety products. The handshake protocol is satisfied by any
Banner Engineering Safety Category 4 (per ISO 13849-1/
EN954-1) device with OSSD outputs or MSSI/USSI inputs.
This handshake verifies that the interface between the two
devices is capable of detecting certain unsafe failures that may
occur (such as a short circuit to a secondary source of power
or to the other channel, high input resistance or loss of signal
ground).
Additional Safety Stop Device Inputs for:
• E-stop switches
• Safety mat controllers
• Rope pull switches
• Other safety modules
• Magnetic safety switch controllers
• Additional PICO-GUARD controllers
System Overview