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34
Binary Channel Selection
The Binary Channel selection is PLC RTX, and
uses the four digital inputs (A–D), as shown
below:
›
DI Com = CS Com
›
DI A =
Bin 1
›
DI B =
Bin 2
›
DI C =
Bin 4
›
DI D =
Bin 8
A binary value of '0' indicates no voltage on
the terminal, while a value of '1' indicates
5–30V DC on the terminal.
Notes & Recommendations
›
Analog Output A is used to retransmit the input process values 1–16, and Analog Output
B is used to retransmit the controller setpoints 1–16.
›
The input and output always share the same range. E.g. If Input 1 is ranged 32–212°F
(0–100°C) and retransmission Channel 1 is selected on DI A–D, then AO A and AO B are
both transmitted as 4–20mA = 32–212°F (0–100°C). Similarly, if Input 2 is ranged for
32–482°F (0–250°C), then AO A and AO B are transmitted as 32–482°F (0–250°C).
›
If AO A process value or AO B setpoint are transmitted to an indicator, then all the inputs
must be ranged the same, (unless the indicator is ranged to 0–100%).
›
In the PLC RTX modes, AO B always retransmits the controller setpoint regardless of
whether the controller is enabled or not.
›
The PLC RTX modes can operate simultaneously with the Scada Comms, allowing a PLC
to read back data that the Scada will be showing.
›
If multiple Zen units are wired to the same PLC, then it is recommended that the analog
inputs to the PLC be isolated.
ZEN-LOG-MAN-16V03 (0930)
DI A
DI B
DI C
BIN 1
BIN 2
BIN 4
0
0
0
1
0
0
0
1
0
1
1
0
0
0
1
1
0
1
0
1
1
1
1
1
0
0
0
1
0
0
0
1
0
1
1
0
0
0
1
1
0
1
0
1
1
1
1
1
Copyright © 2016 Define Instruments
DI D
Retrans.
BIN 8
Channel
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
1
9
10
1
1
11
12
1
1
13
1
14
1
15
1
16
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