Product specifications

Appendix A Hardware Units PM891– Processor Unit
3BSE036351-510 A 267
PM891– Processor Unit
Key Features
• MPC8270 Microprocessor
running at 450 MHz.
• 256 MB RAM with integrity
check (shadow memory).
• Optical ModuleBus interface
that is designed for a
maximum of seven clusters,
of twelve non-redundant or
six redundant modules (that
is, 7x12 = 84 modules).
Redundant and non-
redundant modules can be
combined.
• Three on-board
communication ports:
– CN1 + CN2 (built in, 10/100Mbit/s) Ethernet ports (IEEE 802.3u, 10
Base-T/100Base-Tx).
– COM4 (built in) serial port (RS-232C) for service tool.
• Two Redundancy Control Links — RCU Control Link and RCU Data Link —
for use in redundant configuration.
• Secure Digital (SD) card slot that supports the SD card for loading of
application and for saving the cold retain values cyclically. The SD cards of
various manufacturers are supported.