Section 5
Page 5 - 60
HA243821
Issue 5 Mar 98
MODEL 346 INSTALLATION AND OPERATION MANUAL
5.8.2 SIGNAL WIRING
As shown in figure 5.8.2 below, each of the three re-transmission outputs has three connections associated with
it. For current output, the signal is taken from I (source) and C terminals. For voltage output, V and I terminals
are linked, and the signal appears across the V (positive) and C terminals.
Figure 5.8.2 Signal wiring for current and voltage outputs
5.8.3 CONFIGURATION PAGES
RE-TRANSMISSION SOURCE
This page defines the signal which is to be re-transmitted.
Any channel or derived variable can be selected.
In the case of channels, the re-transmitted voltage is linearised and scaled before being re-transmitted.
RE-TRANSMISSION OUTPUT RANGE
The up / down arrow keys are used to scroll between ‘0 to 20’ or ‘4 to 20’ mA for the output range. If voltage
outputs are required, a range of 0 to 20 mA will give a voltage range of 0 to 5 Volts; a range of 4 to 20 mA will give
a voltage range of 1 to 5 Volts.
RE-TRANSMISSION LOW AND HIGH OUTPUTS
These two pages allow values to be assigned to the output range limits, in channel (DV) units. For example, the
input source may be scaled 0 to 1000 ˚C, but the required re-transmitted output may range only between 400 and
800 ˚C. In such a case, and if an output range of 4 to 20 mA has been chosen, then 4mA will represent 400 ˚C
and 20mA will represent 800 ˚C. Thus 400 and 800 would be the re-transmission low and high outputs entered
using the numeric keys.
Internal
250
Ω
resistor
0 to 20
or 4 to 20mA
signal
Internal
250
Ω
resistor
0 to 5 Volt
or 1 to 5 Volt
signal
V
C
I
V
C
I