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Specification Sheet Page 2

2: ROC364

Master Controller Unit

The Master Controller Unit (MCU) is the key compo-

nent of the ROC364 and consists of:

♦ NEC V25+ microprocessor with on-board memory

♦ On-board memory

♦ FlashPAC or ROCPAC module

♦ Slots for expansion RAM (used only for ROCPAC)

♦ Connections for operator interface

♦ Sockets for two optional communications cards

♦ Status indicators and diagnostic inputs

ROC units with a FlashPAC have some additional

features, such as 1992 AGA flow calculations con-

tained in firmware. See the FlashPAC specifications

sheet (2:MFP) for more information.

The NEC V25+ is a 16-bit CMOS microprocessor that

can address up to one megabyte of memory space.

The MCU comes standard with 128 kilobytes of on-

board, battery-backed, static random access memory

(SRAM) for storing data and 32 kilobytes of electri-

cally-erasable read-only memory (EEPROM) for

storing configuration parameters.

The FlashPAC or ROCPAC module contains the

operating system, ROC communications protocol, and

applications firmware (see other specification sheets).

Both modules provide additional RAM for user

programs and history logs; however, the FlashPAC

has maximum RAM, while the RAM for the ROCPAC

can be expanded by adding RAM modules (described

under “Options”).

The operator interface port provides a means for a

direct link between the ROC364 and a personal

computer. With the computer running ROCLINK

Software (see Specification Sheet 4:RL101 or 4:RFW),

the user can configure the ROC364 and monitor its

operation.

The display port is dedicated to communications

between the MCU and the Local Display Panel

accessory (see Specification Sheet 2.2:LDP).

Through this panel, the user can access information

stored in the ROC364.

The communications card expansion sockets allow

one or two communications cards to be added to the

ROC364. The cards make use of the COM1 and

COM2 ports and can be any of the ROC300-series

communications cards (described under “Options”).

Fuses for input and auxiliary power are readily

accessible from the front of the MCU. Screw

terminals, also located on the front, provide

connections for input power and auxiliary output

power. Auxiliary power outputs are switched by the

MCU under software control and can be used for

auxiliary devices, such as a radio. The source of

auxiliary power is the input power.

LED indicators display ROC status, input power, and

auxiliary power. The ROC status indicator shows

whether operation is normal. The power and auxiliary

output indicators light to show that power is applied.

Diagnostic inputs are provided for monitoring

conditions, such as board temperature, input power

voltage, and transmitter supply voltage.

The MCU has a metal case that helps protect the

electronics from physical damage. For protection from

outdoor environments, the unit must be housed in a

ROC enclosure (see other specification sheets).

Options

A complete ROC364 consists of a Master Controller

Unit and a variety of options. The name and the

quantity of each option that can be accommodated is

shown in Table 1.

Table 1. ROC364 Options

Option Quantity

Module Rack, 16 socket

Backplate

I/O Power Converter Card

I/O Modules

Communication Cards

RAM Expansion Modules*

1, 2, 3, or 4

0 or 1

0 to 64

0, 1, or 2

0, 1, 2, or 3

*Used only when ROCPAC is installed.

The Module Rack provides sockets for up to 16 I/O

modules. A minimum of one Module Rack is required

for any ROC364 connected to field I/O. Up to four

Module Racks can be used with one MCU. The first

Module Rack plugs directly into the MCU. Additional

racks plug into the previous rack.

The Backplate provides a mounting panel for a MCU

and Module Racks. Various backplates are available

for accommodating one, two, or four Module Racks.

The four-rack backplate is used for either three or four

racks.

The I/O Power Converter Card converts the MCU

input power from 12 volts to 24 volts (nominal) for field

transmitters. The converter, which is required only for

12-volt input voltage, can accommodate up to 25

transmitter loops at 20 milliAmps each.

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