Maxiflex P3 PAC User Manual
17
-© Omniflex
UMM126XR18.pdf
2.2.5 Sync Link Port
This port provides connection to the other CPU in dual redundant applications. Use Link
Cable M1812A to connect the Primary and Secondary CPU’s via this port.
2.3 I/O Module support
The Maxiflex P3 CPU’s can interface to both local and remote I/O. One local Maxiflex Rack
and seven Remote I/O Racks can be supported to directly access a total of up to 3808 I/O
points (based upon 32 channel I/O modules) on a single CPU.
Initially P3 CPU’s supported three remote racks. This was upgraded to allow up to seven
remote racks. The earliest versions that support seven remote racks are show in the table
below:
Model
Description
Firmware Supporting Seven Remote Racks
M1260E
P3
V12.40 and above
M1261E
P3c
V12.40 and above
M1262F
P3e
V12.29 and above
M1264A
A3e
V12.40 and above
M1265B
A3e
V12.40 and above
M1267B
P3e-R
V12.40 and above
2.4 Dual Redundant Operation
The P3e-R CPU is designed to operate in dual redundant configuration. In this configuration
each CPU must be mounted on its own local Master Base with its own Power Supply.
I/O Modules may be fitted to these local Bases, but these I/O modules will only be directly
accessible by the CPU on this base.
If shared I/O modules are required, then remote Racks I/O must be used.
2.5 CPU Functions
The P3 CPU contains the following functions:
2.5.1 Real-Time Clock
These CPU’s have a real-time clock as a standard function. This clock has the following
features:
Battery-backed to retain real time while power is off for up to 5 years.
Resolution to 10 milliseconds
Current Time available in the Data Interchange Table
Last Power Up Time available in the Data Interchange Table
Last Power Down Time available in the Data Interchange Table
2.5.2 I/O Scanning
This function is responsible for the automatically scanning of conventional I/O modules
(IOM’s) installed on the Maxiflex base, reading input data and placing it in the DIT, and
writing data from the DIT to the output modules.