User manual

905U Wireless I/O Module User Manual
105S Serial I/O Module
Page 4© October 2001
Important Notice
ELPRO products are designed to be used in industrial environments, by experienced industrial
engineering personnel with adequate knowledge of safety design considerations.
ELPRO radio products are used on unprotected license-free radio bands with radio noise and
interference. The products are designed to operate in the presence of noise and interference, however
in an extreme case, radio noise and interference could cause product operation delays or operation
failure. Like all industrial electronic products, ELPRO products can fail in a variety of modes due to
misuse, age, or malfunction. We recommend that users and designers design systems using design
techniques intended to prevent personal injury or damage during product operation, and provide failure
tolerant systems to prevent personal injury or damage in the event of product failure. Designers must
warn users of the equipment or systems if adequate protection against failure has not been included in
the system design. Designers must include this Important Notice in operating procedures and system
manuals.
These products should not be used in non-industrial applications, or life-support systems, without
consulting ELPRO Technologies first.
1. For 905U modules, a radio licence is not required in many countries, provided the module is
installed using the antenna and equipment configuration complying with the country’s
regulations.. Check with your local distributor for further information on regulations.
2. For 905U modules, operation is authorised by the radio frequency regulatory authority in your
country on a non-protection basis. Although all care is taken in the design of these units, there
is no responsibility taken for sources of external interference. The 905U intelligent
communications protocol aims to correct communication errors due to interference and to
retransmit the required output conditions regularly. However some delay in the operation of
outputs may occur during periods of interference. Systems should be designed to be tolerant of
these delays.
3. To avoid the risk of electrocution, the antenna, antenna cable, serial cables and all terminals of
the 905U/105S module should be electrically protected. To provide maximum surge and
lightning protection, the module should be connected to a suitable earth and the antenna,
antenna cable, serial cables and the module should be installed as recommended in the
Installation Guide.
4. To avoid accidents during maintenance or adjustment of remotely controlled equipment, all
equipment should be first disconnected from the 905U/105S module during these adjustments.
Equipment should carry clear markings to indicate remote or automatic operation. E.g. "This
equipment is remotely controlled and may start without warning. Isolate at the switchboard
before attempting adjustments."
5. The 905U/105S module is not suitable for use in explosive environments without additional
protection.