Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA October 2011

Table 3-2. Resource Block Parameters

Number

Parameter

Description

83

ADVISE_ALM

Alarm indicating advisory alarms. These conditions do not have a direct impact on the

 

 

process or device integrity.

84

HEALTH_INDEX

Parameter representing the overall health of the device, 100 being perfect and 1 being

 

 

non-functioning. The value will be set based on the active PWA alarms in accordance with the

 

 

requirements stated in “Device Alerts and Health Index PlantWeb Implementation Rules”.

 

 

Each device may implement its own unique mapping between the PWA parameters and

 

 

HEALTH_INDEX although a default mapping will be available based on the following rules.

 

 

HEALTH_INDEX will be set based on the highest priority PWA *_ACTIVE bit as follows:

 

 

FAILED_ACTIVE: 0 to 31 - HEALTH_INDEX = 10

 

 

MAINT_ACTIVE: 29 to 31 - HEALTH_INDEX = 20

 

 

MAINT_ACTIVE: 26 to 28 - HEALTH_INDEX = 30

 

 

MAINT_ACTIVE: 19 to 25 - HEALTH_INDEX = 40

 

 

MAINT_ACTIVE: 10 to 16 - HEALTH_INDEX = 50

 

 

MAINT_ACTIVE: 5 to 9 - HEALTH_INDEX = 60

 

 

MAINT_ACTIVE: 0 to 4 - HEALTH_INDEX = 70

 

 

ADVISE_ACTIVE: 16 to 31 - HEALTH_INDEX = 80

 

 

ADVISE_ACTIVE: 0 to 15 - HEALTH_INDEX = 90

 

 

NONE - HEALTH_INDEX = 100

85

PWA_SIMULATE

Allows direct writes to the PlantWeb Alert "ACTIVE" parameters and

 

 

RB.DETAILED_STATUS. The simulate jumper must be "ON' and the SIMULATE_STATE

 

 

must be "Jumper on, simulation allowed" before PWA_SIMULATE can be active.

Block Errors

Table 3-3lists conditions reported in the BLOCK_ERR parameter.

Table 3-3. BLOCK_ERR

.

 

Conditions

Number

Name and Description

 

0

Other

 

1

Block Configuration Error: A feature in CYCLE_SEL is set that is not supported by

 

 

CYCLE_TYPE.

 

3

Simulate Active: This indicates that the simulation jumper is in place. This is not an

 

 

indication that the I/O blocks are using simulated data.

 

7

Input failure/process variable has bad status

 

9

Memory Failure: A memory failure has occurred in FLASH, RAM, or EEPROM

 

 

memory.

 

10

Lost Static Data: Static data that is stored in non-volatile memory

 

 

has been lost.

 

11

Lost NV Data: Non-volatile data that is stored in non-volatile memory

 

 

has been lost.

 

13

Device Needs Maintenance Now

 

14

Power Up: The device was just powered-up.

 

15

OOS: The actual mode is out of service.

Modes

The resource block supports two modes of operation as defined by the

MODE_BLK parameter:

Automatic (Auto)

The block is processing its normal background memory checks.

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Emerson 848T manual Block Errors, Modes, Automatic Auto, Block is processing its normal background memory checks

848T specifications

The Emerson 848T is a state-of-the-art temperature transmitter designed for accurate and reliable temperature measurement in various industrial applications. This device has gained recognition for its advanced features and robust performance, making it a popular choice among engineers and technicians in the field.

One of the key highlights of the Emerson 848T is its unique dual-channel capability, which allows it to seamlessly monitor two temperature sources simultaneously. This functionality is particularly beneficial in processes where multiple temperature points need to be assessed, optimizing efficiency and reducing the need for additional equipment. It supports various sensor types, including thermocouples, RTDs, and resistance temperature detectors, making it versatile for different applications.

The 848T is equipped with sophisticated digital processing technology, which enhances its accuracy and stability. It features a 24-bit analog-to-digital converter, ensuring precise measurement and minimizing drift over time. Moreover, the device boasts a wide operating temperature range, accommodating ambient conditions from -40°C to 85°C. This durability makes it suitable for harsh environments commonly encountered in industries such as oil and gas, pharmaceuticals, and power generation.

Another significant characteristic of the Emerson 848T is its configurable output options. Users can choose from a range of output signals, including 4-20 mA, which provides a standard interface for integration into existing control systems. Additionally, it offers a HART communication protocol, allowing for easy configuration, calibration, and diagnostics through a digital interface. This feature enhances the transmitter's usability, enabling operators to perform adjustments without direct access to the device.

The device is designed with user-friendliness in mind. Its intuitive setup procedure and robust graphical user interface simplify the commissioning process, ensuring that even those new to the technology can easily navigate the system. An integrated LCD display provides real-time readings and status information, facilitating monitoring at a glance.

In summary, the Emerson 848T temperature transmitter combines reliable performance, user-friendly design, and advanced digital technologies. Its dual-channel capability, wide sensor compatibility, and adjustable output options make it an essential tool for achieving precise temperature measurements in various industrial settings. With these compelling features, the Emerson 848T stands out as a leading choice for professionals seeking accuracy and efficiency in their temperature monitoring applications.