Emerson ROC827 instruction manual Processor and Memory, Real-Time Clock RTC

ROC827 Instruction Manual

ƒDiagnostic monitoring.

ƒReal-Time Clock.

ƒAutomatic self-tests.

ƒPower saving modes.

ƒLocal Operator Interface (LOI) EIA-232 (RS-232D) Local Port.

ƒEIA-232 (RS-232C) serial Comm2 port.

ƒEthernet Comm1 port.

1.2.2Processor and Memory

The ROC827 uses a 32-bit microprocessor with processor bus clock frequency at 50 MHz with a watchdog timer. The Motorola MPC862 Quad Integrated Communications Controller (PowerQUICC) PowerPC processor and the Real-Time Operating System (RTOS) provide both hardware and software memory protection.

1.2.3 Real-Time Clock (RTC)

You can set the ROC827’s Real-Time Clock (RTC) for year, month, day, hour, minute, and second. The clock provides time stamping of the database values. The battery-backed clock firmware tracks the day of the week, corrects for leap year, and adjusts for daylight savings time (user- selectable). The time chip automatically switches to backup power when the ROC827 loses primary input power.

The internal Sanyo 3-volt CR2430 lithium battery provides backup for the data and the Real-Time Clock when the main power is not connected. The battery has a one-year minimum backup life with the battery is installed, the jumper disengaged, and no power applied to the ROC827. The battery has a ten-year backup life with the backup battery installed and power applied to the ROC827 or when the battery is removed from the ROC827.

Note: If the Real-Time Clock does not keep the current time when you remove power, replace the lithium battery.

Issued Mar-06 General Information 1-6