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Figure 12:
Example of the inclusion of
a relay output module in the
MELSEC-WS safety
controller
ATTENTION
Note
Product description
3.10
WS0-4RO safety relay output module
3.10.1
Description
The WS0-4RO safety relay output module provides dual-channel contact-based
outputs with positively guided relay contacts.
The WS0-4RO safety relay output module cannot be used independently, but need to
be switched via a WS0-XTIO module. To this purpose a control output of the
WS0-XTIO module (Q1...Q4) has to be jumpered to a control input of the relay output
module (B1, B2), see the following figure.
Monitor the feedback contacts using an EDM function block!
It is not sufficient to connect the control outputs B1 or B1/B2. Additionally, the
feedback contacts Y1/Y2 and Y3/Y4 on the WS0-4RO safety relay module must be
monitored using an EDM function block in the Setting and Monitoring Tool logic editor.
The safety relay output module is not participating at the FLEXBUS+ backplane bus
communication. Control signals can therefore not be received from the CPU module.
A max. of four WS0-4RO safety relay output modules can be connected to a
MELSEC-WS safety controller, i.e. a maximum of 16 safe relay outputs are available.
WS0-4RO
The WS0-4RO has two control inputs (B1, B2). These control two times two internal
relays that provide two independently redundant switch-off paths.
Control input (B1) controls two internal relays and provides a redundant switch-off
path consisting of:
two safe enabling circuits (13/14, 23/24), dual-channel and potential-free,
a signaling circuit (Y14), dual-channel and connected to internal 24 V DC,
a feedback EDM (Y1/Y2), dual-channel and potential-free.
Control input (B2) controls two internal relays and forms a redundant switch-off path
consisting of:
Chapter 3
42
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Troubleshooting
