Momentum Modbus Plus 170 PNT Series Guía de usuario Pagina 64

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Overview of Momentum Option Adapters
64
870USE10110 July 2004
2.1 Introducing the Momentum Option Adapters
Basic Features of Option Adapters
Introduction This section describes the basic features common to all option adapters.
the battery
a time-of-day (TOD) clock
the communication port(s)
Battery The battery backs up the CPU’s user program and state RAM.
TOD Clock The TOD clock allows you to use the date and time as an element in your user
program.
Communication
Ports
The three Momentum option adapters are distinguished by the communications
ports they offer, as shown in the table below.
Option Adapter Communication Port(s)
172 JNN 210 32 Software-selectable RS232/RS485 serial port
172 PNN 210 22 One Modbus Plus port
172 PNN 260 22 Two Modbus Plus ports for a redundant (back-up) cable run
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