Analog Retransmission - Brainchild BTC-2500 User Manual

4 9 Analog Retransmission

4 9 Analog Retransmission
The Analog Retransmission is available for model number BTC-2500-XXXXXN The Analog Retransmission is available for model number BTC-2500-XXXXXN
Where N 3,4 or 5. See Ordering Code in Where N 3,4 or 5. See Ordering Code in = =
Setup
Select FULL for FUNC in the setup menu. Select FULL for FUNC in the setup menu.
COMM selects a correct output signal which should be accordant with the COMM selects a correct output signal which should be accordant with the
retransmission option used. Five types of retransmission output are available. retransmission option used. Five types of retransmission output are available.
These are : 4-20 mA, 0-20mA, 0-5V, 1-5V and 0-10V. There are 8 types of These are : 4-20 mA, 0-20mA, 0-5V, 1-5V and 0-10V. There are 8 types of
parameters that can be retransmitted according to the Analog Function ( parameters that can be retransmitted according to the Analog Function (
AOFN ) selected. These are : PV1, PV2, PV1 PV2, PV2 PV1, SV, MV1, MV2 AOFN ) selected. These are : PV1, PV2, PV1 PV2, PV2 PV1, SV, MV1, MV2
and PV SV. Refer to and PV SV. Refer to Table 1.4 Table 1.4
value corresponding to output zero and AOHI selects a value corresponding value corresponding to output zero and AOHI selects a value corresponding
to output SPAN. to output SPAN.
How to Determine Output Signal: How to Determine Output Signal:
AOLO and AOHI are set to map to output signal LOW SL ( e.g. 4mA ) and AOLO and AOHI are set to map to output signal LOW SL ( e.g. 4mA ) and
output signal High SH ( e.g. 20mA ) respectively. The analog output signal output signal High SH ( e.g. 20mA ) respectively. The analog output signal
AOS corresponding to an arbitrary value of parameter AOV is determined by AOS corresponding to an arbitrary value of parameter AOV is determined by
the following curve. the following curve.
Output Output
Signal Signal
SH
AOS
SL
AOLO AOV AOHI
Formula:
AOS=SL ( AOV AOLO ) AOS=SL ( AOV AOLO ) + +
AOV=AOLO ( AOS AOV=AOLO ( AOS
Notes:
The setup values used for AOHI and AOLO must not be equal, otherwise, The setup values used for AOHI and AOLO must not be equal, otherwise,
incorrect value will happen. However, AOHI can be set either higher or lower incorrect value will happen. However, AOHI can be set either higher or lower
than AOLO. If AOHI is set higher than AOLO it could result in a direct than AOLO. If AOHI is set higher than AOLO it could result in a direct
conversion. If AOHI is set lower than AOLO it could result in a reverse conversion. If AOHI is set lower than AOLO it could result in a reverse
conversion. conversion.
Example
A control uses 4-20 mA analog output to retransmit difference value between A control uses 4-20 mA analog output to retransmit difference value between
input 1 and input 2 ( PV1 PV2 ). It is required that if the difference value is input 1 and input 2 ( PV1 PV2 ). It is required that if the difference value is
100, 4mA will be exported, and if the difference value is 100, 20mA will be 100, 4mA will be exported, and if the difference value is 100, 20mA will be
exported. Make the following Setup for BTC-2500: exported. Make the following Setup for BTC-2500:
IN1U PU, DP1 NODP , IN2U PU, DP2 NODP , FUNC FULL, COMM 4-20, IN1U PU, DP1 NODP , IN2U PU, DP2 NODP , FUNC FULL, COMM 4-20, = = = =
AOFN P1-2, AOLO -100, AOHI 100 AOFN P1-2, AOLO -100, AOHI 100 = = = =
section 1-2. section 1-2.
for a complete description. AOLO selects a for a complete description. AOLO selects a
Parameter Value Parameter Value
SH SL SH SL
AOHI AOHI AOLO AOLO
AOHI AOHI AOLO AOLO
+ + SL ) SL )
SH SL SH SL
= = = =
= =
= = = =
UM25001C
Setup Menu Setup Menu
FUNC FUNC
COMM COMM
AOFN AOFN
AOLO AOLO
AOHI AOHI
Terminals
AO+ AO+
12
13 AO
Figure 4.6 Figure 4.6
Conversion Curve Conversion Curve
for Retransmission for Retransmission
NOTES
AOHI AOLO AOHI AOLO = =
AOHI AOLO: AOHI AOLO: > >
Direct Conversion Direct Conversion
AOHI AOLO: AOHI AOLO: < <
Reverse Conversion Reverse Conversion
- -
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