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Processor Base Unit

A processor base unit holds up to three processor modules:

External Ethernet, Serial Data and Power Connections The processor base unit external connections are:

Earthing Stud • Ethernet Ports (E1-1 to E3-2) • Serial Ports (S1-1 to S3-2) • Redundant +24 Vdc powers supply (PWR-1 and PWR-2) • Program Enable security key (KEY) • The FLT connector (currently not used).

The power connections supply all three modules with redundant power, each processor module each have two Serial ports and two Ethernet port connectors. The KEY connector supports all three processor modules and helps prevent access to the application unless the Program Enable key is inserted.

Serial Communications Ports The serial ports (S1-1 and S1-2; S2-1 and S2-2; S3-1 and S3-2) support the following signal modes depending on use: • RS485fd: A four-wire full duplex connection that features different busses for transmit and receive. This selection must also be used when the controller is acting as a MODBUS Master using the optional fourwire definition specified in Section 3.3.3 of the MODBUS-over-serial standard. • RS485fdmux: A four-wire full-duplex connection with tri-state outputs on the transmit connections. This must be used when the controller is acting as a MODBUS Slave on a four-wire bus. • RS485hdmux: A two-wire half duplex connection applicable for master slave or slave use. This is shown in the MODBUS-over-serial standard.

Processor Back-up Battery The T9110 processor module has a back-up battery that powers its internal Real Time Clock (RTC) and a part of the volatile memory (RAM). The battery only supplies power when the processor module is no longer powered from thesystem power supplies. The specific functions that the battery maintains on complete loss of power are: • Real Time Clock - The battery supplies power to the RTC chip itself. • Retained Variables - Data for retained variables is stored at the end of each application scan in a portion of RAM, backed up by the battery. On restoration of power' the retained data is loaded back into the variables assigned as retained variables for use by the application. • Diagnostic logs - The processor diagnostic logs are stored in the portion of RAM backed by the battery. The battery has a design life of 10 years when the processor module is continually powered; for processor modules that are un-powered, the design life is up to 6 months. Battery design life is based on operating at a constant 25°C and low humidity. High humidity, temperature and frequent power cycles will shorten the operational life of the battery.