Schneider Electric Processor Adapter - Manual (Page 66)

Option Adapters
66 870 USE 101 10 V.2
Section 2.1
Introducing the Momentum Option Adapters
Basic Features of Option Adapters
Introduction This section describes the basic features of all Option Adapters:
l Batteries
l
A time-of-day (TOD) clock
l Communication port(s)
Batteries The batteries back up the CPU’s user program and state RAM.
Time-of-Day
Clock The time-of-day 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