Digital System Integration Information; Wiring Variations; Loop Wiring Procedure - Honeywell stt850 SMARTLINE User Manual

Additional consideration is required when selecting intrinsic safety barriers to ensure that they will
supply at least minimum Transmitter voltage (V
resistance (typically within the barriers) needed for digital communications.
Transmitter loop parameters are as follows:
R = maximum loop resistance (barriers plus wiring) that will allow proper Transmitter
LOOP MAX
operation and is calculated as R
In this calculation:
V = 11.8 V (HART) or 13.8V (DE) V
XMTR MIN
Note that V should only be considered if a remote meter will be connected to the transmitter.
SM
The positive and negative loop wires are connected to the positive (+) and negative (–) terminals on
the terminal block in the Transmitter Electronics Housing.
Barriers can be installed per Honeywell's instructions for Transmitters to be used in intrinsically safe
applications.

3.1.5 Digital System Integration Information

DE transmitters that are to be digitally integrated to Honeywell's Total Plant Solution (TPS) system
will be connected to the Temperature Transmitter Interface Module in the Process Manager,
Advanced Process Manager or High Performance Process Manager through a Field Termination
Assembly. Details about the TPS system connections are given in the PM/APM SmartLine
Transmitter Integration Manual, PM12-410, which is part of the TDC 3000
If you are digitally integrating a Transmitter in an Allen Bradley Programmable Logic Controller
(PLC) process system, the same Field Terminal Assembly (FTA) and wiring procedures used with
Honeywell's TPS system are also used with the Allen-Bradley 1771 and 1746 platforms.

3.1.6 Wiring Variations

The above procedures are used to connect power to a Transmitter. For loop wiring, sensor wiring and
external wiring, detailed drawings are provided for Transmitter installation in non-intrinsically safe
areas and for intrinsically safe loops in hazardous area locations.
If you are using the Transmitter with Honeywell's TPS system, see PM/APM Smartline Transmitter
Integration Manual, PM12-410, which is part of the TDC 3000

3.1.7 Loop Wiring Procedure

1. See Figure 7, above, for parts locations. Loosen the end cap lock using a 1.5 mm Allen wrench.
2. Remove the end cap cover from the terminal block end of the Electronics Housing.
3. Feed loop power leads through one end of the conduit entrances on either side of the
Electronics Housing. The Transmitter accepts up to 16 AWG wire.
4. Plug the unused conduit entrance with a conduit plug appropriate for the environment.
5. Connect the positive loop power lead to the positive (+) terminal #1 and the negative loop
power lead to the negative (-) terminal #2. Note that the Transmitter is not polarity-sensitive.
6. Replace the end cap, and secure it in place.
Page 12
XMTR MIN
= (V
LOOP MAX SUPPLY MIN
STT850 Temperature Transmitter User's Manual
), including the required 250 ohms of
)  21.8 mA.
– V
- V
XMTR MIN SM
= 2.3 V, remote meter
SM
X
X
system bookset.
system bookset.
Revision 3