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12
About the Modules
I/O Module Overview
Publication 1791DS-UM001H-EN-P - April 2009
The Guard I/O modules implement the CIP-safety protocol extensions
over DeviceNet networks and provide various features for a safety
system.
Use the modules to construct a safety-control network system that
meets the requirements for Safety Integrity Level 3 (SIL 3) as defined
in IEC 61508, Functional Safety of Electrical, Electronic, and
Programmable Electronic Safety-related Systems, and the requirements
for Safety Category 4 of the EN 954-1 standard.
Remote I/O communication for safety I/O data are performed through
safety connections supporting CIP safety over a DeviceNet network,
and data processing is performed in the safety controller.
The status and fault diagnostics of safety I/O modules is monitored by
a safety PLC through a safety connection using a new or existing
DeviceNet network.
Here is a list of features common to all Guard I/O modules.
CIP-safety protocol conformance
Safety inputs
– Contact output devices, such as emergency stop push
buttons, gate switches, and safety light curtains, can be
connected.
– Dual-channel mode evaluates consistency between two input
signals (channels), which allows use of the module for Safety
Category 4.
– The time of a logical discrepancy between two channels can
be monitored using a discrepancy time setting.
– An external wiring short-circuit check is possible by turning
on an input. The module must be wired in combination with
test outputs when this function is used.
– Independently adjustable on and off delay is available per
channel.
Test outputs
– Separate test outputs are provided.
– Broken wires detection is supplied on muting outputs.
– Power (24V) can be supplied to devices, such as safety
sensors.
– Test outputs can be set as standard outputs for use as monitor
outputs.
– All Guard I/O modules have numerous test outputs, of which
some can be used for control and monitoring of a muting
lamp.
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