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• At the shipment to end-users, confirm the safety related setting by monitoring status and
displayed details of the programming tools and displays. Also, record and save the setting
data of safety-related information and programming tools by using check sheet, etc.
• Safety cannot be secured unless assembling, installation, wiring and adjustment of the
machine are completed. For the installation, wiring and adjustment, follow the instructions
in the user's manual of each module.
• Only qualified personnel are authorized to install, start-up, repair or service the machines in
which components are installed. Only trained engineers should install and operate the
equipment. (ISO 13849-1 Table F.1 No.5)
• Separate the wiring for safety function from other signal wirings.
(ISO 13849-1 Table F.1 No.1)
• Protect the cables with appropriate ways (routing them in a cabinet, using a cable guard,
etc.)
• To use the switch, relay and sensor which complies with the safety standards is
recommended. In case of using the switch, relay and sensor which does not comply with
the safety standard, please apply them for the certifications.
• Keep the required clearance/creepage distance depending on voltage.
• Time to detect the safety observation error depend on the process cycle of safety
observation of each CPU.
The residual risk in each function of safety function is shown below.
(1) Safety signal comparison
• Make sure that the mounting location of the safety signal module, MT Developer2
number head device, and GX Works2/GX Developer I/O assignments are correctly set.
• When a signal error occurs, make sure that safety is secured within the signal mismatch
permissible time that is set by a parameter.
• Even when a signal error occurs, the servo motor does not stop automatically. Give a
(forced) stop command and execute a forced stop processing.
• Make sure that the ladder name to be written to a PLC CPU is not the same as that of
sequence programs for safety observation.
• Make sure that the safety signal is properly input via two different paths.
• Make sure that the screws will not get loose after fixing the connector on the safety
signal module.
• Make sure that all the modules are firmly inserted into the main base unit or extension
base unit.
• Scan time processing must be within 100ms so that PLC CPU performs the comparison
function within a certain process time. Make sure that the program contents can be
handled less than 100ms. If the scan time is 100ms or longer, PLC CPU should be
added for safety to distribute the load of the safety process.
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