RM-23A Control/Display Module

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RM-23A Control/Display Module

MAJOR ASSEMBLIES

Channel Keys
Command Keys
Item Keypad
Numerical display
Status Lights

OPERATION

The RM-23A Control/Display Module provides independent control of the RM-80 Microprocessor and associated radiation monitoring equipment. The RM-23A Control/Display Module continuously polls the RM-80 for the radiation levels, alarms, and operation status. The RM-23A Control/Display Module features a front panel operator interface and includes the numerical display, 12-channel status LEDs, 8 control keys, 3 status LEDs, and 16 data entry keys.

The RM-23A Control/Display Module numerical display provides the value of the last selected channel radiation reading, channel item, or monitor item from the most recent RM-80 Microprocessor poll. The operational status and alarm condition for each channel of the RM-80 Microprocessor is indicated on the face of the RM-23A Control/Display module by a set of 12 LED indicators. A green LED for each channel is "ON" to indicate a normal operating condition. Each channel also has a red and an amber LED; the red is lit when high radiation exists; the amber is lit when alert radiation conditions exist.

When high or alert alarms exist, the corresponding channel-select key lights intermittently until the operator acknowledges the alarm by pushing the key. Once acknowledged, the key will remain lit if the channel is still in alarm; if the channel is not in alarm, then it turns off.

Channel radiation readings are requested using the first row of four keys (channel-select keys). The second row of four keys is used to issue commands to the RM-80 Microprocessor including:

Pump start/stop (FLOW)
Filter fast advance (FILT)
Purge (PURGE)
Checksource test (C/S)

A separate set of 3 led indicators provides status of the RM-23A’s operation.

While a command is in progress, its corresponding command key is lit. Channel and monitor items are part of the RM-80 Microprocessor data base and are selected for display from the 16-item keypad at the lower half of the RM-23A Control/Display Module.

Loading and changing of data base items are also accomplished from the keypad. A two-position key-lock switch for the RM-23A Control/Display Module controls access for data base changes.

The RM-23A Control/Display Module provides six 4-to-20 mA analog outputs, the first four corresponding to the channel readings. The scaling parameters for analog outputs are obtained from the RM-80 Microprocessor data base.

The RM-23A Control/Display module software allows the operator to run a series of diagnostic tests to confirm proper operation of the hardware. Hardware functions such as inputs (keypad, digital, serial), outputs (digital, serial, analog), EPROM and RAM memory, and lamps/LEDs can be individually tested.

The RM-23L Control/Display Module provides partial control and display of monitor parameters. The RM-23L Control/Display Module (shown below) mounts on the front of an RM-80 Microprocessor. It contains the upper portion of the RM -23A Control/Display Module. The channel-select and command keys provide the same functions as the RM-23A. The RM-80 Microprocessor data base changes cannot be made with the RM-23L Control/Display module since the 16-item keypad is not provided. The RM-23L Control/Display Module is administratively controlled by locating the unit behind a key-locked door.

The RM-23P Control/Display Module is a portable, test-unit version of the RM-23A. It consists of an RM-23A Control/Display Module and a 3 A, 8 V power supply housed in a convenient carrying case. Communication with an RM-80 Microprocessor is identical to the RM-23A Control/Display Module. The RM-23P communications cord is connected to an RM-80 Microprocessor through a connector on the RM-80 motherboard. Connecting the RM-23P Control/Display Module overrides communication to a hard-wired RM-23A. The 115 V ac convenience outlet in the RM-80 Microprocessor provides ac power for the RM-23P.

A modified NIM bin is capable of housing up to four RM-23A Control/Display Modules. The NIM bin is powered from a single power supply on a separate panel. Electrical connections are made at the rear of the NIM bin. SE also supplies fully-qualified control room cabinets for housing NIM bins, power supplies, and recorders for safety-related applications.