Specifications

25PLCs
in order to tolerate any ground
dierences on the factory oor and
to protect against any electrical noise
on the lines from peripheral sensors.
Harsh conditions typical of industrial
applications can make protecting
the interface cabling and devices a
challenge. It is crucial, therefore, that
both the device(s) and system withstand
harsh conditions. Only in this way
can one ensure that the PLC system’s
signal integrity and system reliability
are maintained. To ensure that the
system is protected in harsh industrial
environments, PLC designers need to
incorporate quite specic safeguards:
• Protection from high ESD: up
to ±35kV (HBM) and ±20kV
(Air Gap, IEC 61000-4-2)
• Fault protection: tolerance
to shorts up to ±80V
• Isolation to allow large common-
mode ground differentials
• Line termination to reduce
reflections on the cables
• Automotive temperature
grade (-40°C to +125°C)
HOT-SWAP
CONTROLLER
VOLTAGE
MONITORS
ISOLATED POWER SUPPLY
CAN
RS-232
PROFIBUS
FIELDBUS
UART
RS-485
FAULT
PROTECTION
ISOLATION
CONTROLLER
BACKPLANE
RS-485
TERMINATION
ETHERNET
LVDS
= MAXIM SOLUTION
The fieldbus is connected to the PLC backplane by the fieldbus module.