03/03 3 - 16 DS 2.501A
INSTALLATION GUIDELINES
Termination of Satchnet field wiring should be made at a dedicated
location or terminal rail, segregated from other terminals.
e.g. within a motor starter panel, a separate terminal rail (or section of
rail) should be employed.
Where a common terminal rail is employed, a separation of 100mm
between Satchnet field wiring terminals and other terminals, must be
maintained. Satchnet field wiring from the terminal rail to the
networking controllers should be segregated from Mains and Power
wiring by running it in a separate trunking, tray or harness.
Screening of multicore cables, or individual pairs must be continuous.
The screen of the cable must only be earthed at the common earth
point.
The common earth point should be connected to the controller earth
(0V Terminal) by a single cable which should be as short as possible
and no more than 150mm long.
The serial link cable must be screened and earthed at a common earth
point, located near to the personal Computer, not at the controller
devices. IAC200/400/600, Touch-screen and CVR serial link screens
must be connected to the IAC/Touch-screen/
CVR isolated earth terminal.
Non preferred cables (e.g. MICC)
Where these types of cables are mandatory, it is recommended that
they be terminated within a purpose-made terminal box immediately
adjacent to the network products cable entry point, and that final
connections to the network products be made using flexible, screened
cables as described above.
Since the copper sheath of the Mineral insulated cable forms the
earthed screen of these cables, only Satchnet controller Input
conductors at extra low voltage may be contained within the cable
sheath.
CONDUCTOR FUNCTION
Conductor functions may not be shared. Each input pair shall have a
dedicated 0V conductor as part of the pair.
Two or more Input/Output signals may NOT share a common 0V
conductor.
Under no circumstances shall Input signal cables share a common 0V
conductor with a power supply (e.g. to active sensors or actuators).
Where a field device such as a sensor or actuator employs a common
0V termination for both power and signal, then two 0V conductors must
be taken to the device: one for signal, one for power.
SECTION 2 – COMMUNICATION SCHEMES
All IAC RS485 communication ports are optically isolated, which
protects the units from differential ground potentials e.g. earth loop
damage.
The RS485 mechanism works through a differential voltage which
must be referenced to a level, which is provided by the communication
cable screen making a 3 wire system.
To make communication as reliable as possible, the screen must be
connected to isolated ground as follows:
IAC 400
Fig.1
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