Hach ANATEL PAT700 User Manual - page 34
Page 32
Installation
Discrete outputs
The analyzer has four discrete outputs, as listed in
and
•
Discrete output 1 is a TOC alarm. The output reports the TOC level as above (low
state) or below (high state) the user-specified alarm limit.
•
Discrete output 2 is an uncompensated conductivity alarm. A low state indicates the
conductivity level is above the alarm limit. A high state indicates the conductivity level
is below the alarm limit.
•
Discrete output 3 reports a warning or failure condition. A low state indicates an error
condition exists. A high state indicates no error conditions exist.
•
Discrete output 4 reports a TOC analysis start (by indicating the state of the sample
inlet valve). A low state indicates the sample valve is closed. A high state indicates the
sample valve is open.
Table 9 Discrete outputs 1 and 2 wiring terminal designations
Wiring
connector
1-2
Terminal
Description
Variable
Designation
1
Digital output 1 (+)
TOC alarm
DO1+
2
Digital output 2 (+)
Uncompensated conductivity
alarm
DO2+
3
Common return for discrete outputs 1 and 2 (–)
TOC alarm,
uncompensated conductivity
alarm
DO1/2–
4
•
12 VDC power supply +
•
Connect only if input device requires power
supply
Input power supply
+12V
5
•
12 VDC power supply –
•
Connect only if input device requires power
supply
Input power supply
GND
Table 10 Discrete outputs 3 and 4 wiring terminal designations
Wiring
connector
3-4
Terminal
Description
Variable
Designation
1
Digital output 3 (+)
Warning or failure
DO3+
2
Digital output 4 (+)
TOC analysis start
DO4+
3
Common return for discrete outputs 3 and 4 (–)
Warning or failure,
TOC analysis start
DO3/4–
4
•
12 VDC power supply +
•
Connect only if input device requires power
supply
Input power supply
+12V
5
•
12 VDC power supply –
•
Connect only if input device requires power
supply
Input power supply
GND