Product specifications

3BSE036351-510 A 239
Appendix A Hardware Units
PM851/PM856/PM860 and TP830 – Processor Unit
Key Features
• MPC860 Microprocessor running at 48 MHz.
•8 MB RAM with internal or external battery
back-up facility.
• 12 x S800 I/O units can be connected to the
electrical ModuleBus.
• Four on-board communication ports:
– CN1 + CN2, Ethernet ports 
(IEEE 802.3, 10BaseT)
– COM3, serial port (RS-232C) with modem
support
– COM4, serial port (RS-232C) for service
tool
• Basic communication is extendable by using
additional communication interface units.
This section does not apply to the Feature Pack release of System 800xA 5.1.
See PM851A/PM856A/PM860A and TP830 – Processor Unit on page 245.
The data for PM851 is the same as for PM856 except, no support for CN2.
The data for PM856 is the same as for PM860 except for performance of
application program execution, see
Performance Data on page 244.