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12.2
Installation of fiber-optic cables
Introduction
Fiber-optic cables may only be installed by trained and qualified personnel. Always observe
the applicable rules and statutory regulations. The installation must be carried out with
meticulous care, because faulty installations represent the most common source of error.
Causes are:
● Kinking of the fiber-optic cable due to an insufficient bending radius.
● Crushing of the cable as a result of excess forces caused by persons treading on the
● Overstretching due to high tensile forces.
● Damage on sharp edges etc.
Permitted bending radius for prefabricated cables
You may not go below the following bending radius when laying the cable:
● Next to connector: 55 mm
● During installation: 60 mm (repeated)
● After installation: 40 mm (one-time)
Points to observe when installing the fiber-optic cables for the S7-400H synchronization link
Always route the two fiber-optic cables separately. This increases availability and protects
the fiber-optic cables from potential double errors caused, for example, by interrupting both
cables at the same time.
Always make sure the fiber-optic cables are connected to both CPUs before switching on the
power supply or the system, otherwise the CPUs may process the user program as the
master CPU.
Local quality assurance
Check the points outlined below before you install the fiber-optic cables:
● Does the delivered package contain the correct fiber-optic cables?
● Any visible transport damage to the product?
● Have you organized a suitable intermediate on-site storage for the fiber-optic cables?
● Does the category of the cables match the connecting components?
Check the attenuation of the fiber-optic cables after installation.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
cable, or by pinching, or by the load of other heavy cables.
Synchronization modules
12.2 Installation of fiber-optic cables
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