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9.1.2 Analogue inputs-Probes
Temperature probes
The temperature probes have no characteristic insertion polarity and can be
extended using standard bipolar cable (note that extending cables can affect the
performance of the device in terms of electromagnetic compatibility: take great
care with the wiring).
Important!
Pressure probes Humidity probes
Pressure probes have a specific insertion polarity which must be observed.
Signal cables (temperature/pressure/humidity probes, digital inputs) must be
cabled separately from high voltage cables.
Eliwell supplied cables are recommended. Contact Eliwell sales department for
item availability.
9.1.3 RS485 connection
RS485
Use a shielded and “
twisted
” , twin-conductor 0.5mm2 section cable, plus
braiding (i.e. Belden cable model 8762 with PVC sleeve, 2 conductors plus
braiding, 20 AWG, nominal capacity between 89pF conductors, nominal capacity
between a conductor and 161pF shielding).
See standards relating to EN 50174 data transmission systems for indications on
how to lay cables.
Make sure data transmission circuits are well separated from power lines.
A RS-485 network up to 1200m in length featuring a maximum of 15 devices can
be connected straight to the device.
This length can be extended and the number of devices for each channel increased
using appropriate repeater modules.
See the “Installation of the RS- 485 network” manual for more detailed
information.
Attach the120 (Ohm) 1/4W resistors between the “+” and “-“ terminals on the
interface and last device in each branch of the network.
9.1.4 RS-232 serial connections
Use the RS232 DB9-DB9 nullmodem cable provided or equivalent cable to
connect to a PC.
Summary of Contents for Memory 1000
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