Page 20 Installation – PAT700 Total Organic Carbon Analyzer
Operator Manual Anatel
WGM - 28 November 2007 - Edition 01
Discrete inputs
The analyzer has two discrete inputs. Wiring connects to terminals on connector block J24, as
listed in Table 2-4.
• Discrete input 1 initiates TOC analysis. When the output state switches from high to
low, the analyzer stops the current operation and runs a single TOC analysis. After the
analysis is complete, the analyzer returns to the mode defined by digital input 2. During
the TOC analysis, the analyzer ignores all subsequent trigger values.
• Discrete input 2 switches the analyzer modes. If digital output 2 is in high state, the
analyzer is in TOC mode. If digital output 2 is in low state, the analyzer runs in flow with
conductivity mode.
Discrete outputs
The analyzer has four discrete outputs. Wiring connects to terminals on connector block J22,
as listed in Table 2-5.
• 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.
Table 2-3
J17 connector block: 4-20 mA output wiring terminal designations
J17 Block Terminal Description Variable Designation
1 4-20 mA source output for analog output 1 (+) TOC AO1+
2 4-20 mA sink output for analog output 1 (–) TOC AO1-
3 4-20 mA source output for analog output 2 (+) Conductivity or resistivity AO2+
4 4-20 mA sink output for analog output 2 (–) Conductivity or resistivity AO2-
5 4-20 mA source output for analog output 3 (+) Temperature AO3+
6 4-20 mA sink output for analog output 3 (–) Temperature AO3-
Table 2-4 J24 connector block: Discrete input wiring terminal designations
J24 Block Terminal Description Variable Designation
1 Common connection for external sourcing (+) Common DI1/2+
2 Digital input 1 voltage source return input (–) Initiates TOC analysis DI1–
3 Digital input 2 voltage source return input (–) Analyzer mode DI2–
4 • 12 VDC power supply +
• Connect only if output device requires
power supply
Output power supply +12V
5 • 12 VDC power supply –
• Connect only if output device requires
power supply
Output power supply GND
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