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Digital Control Channels
On present Maxum II analyzers, the solenoid control circuitry is on the PECM. Digital outputs
assigned to each solenoid valve are shown in the table below. If a digital output is 0 the valve
is OFF; if the output is a 1, the valve is ON. Each group of four valves is identified as being
left or right. There are no digital inputs. See the table below for the numbering pattern of
solenoid valves (same for original and newer versions). Each solenoid valve can be manually
set to the ON or OFF conditions by manually depressing the red button on each solenoid. This
button is on the top-front of each Parker (original) solenoid and on the bottom of each SMC
(new) solenoid.
Table 2-5
Table 2-6
SYSCON
Channel
Number
Table 2-7
Fault Indicator
VALVE_SWITCH_ERROR
J10_DISCONNECTED (left bank connector)
J11_DISCONNECTED (right bank connector)
Maxum II Reference Manual
Manual, 7/2017, 2000596-001
Electronic Compartment Component Descriptions and Maintenance Procedures
Digital Output Solenoid Valve Groups
Group
Left
Right
SVCM I/O Assignments
I/O Name
DO1
LEFT_GROUP_VALVE_1
DO 2
LEFT_GROUP_VALVE_2
DO 3
LEFT_GROUP_VALVE_3
DO 4
LEFT_GROUP_VALVE_4
DO 5
RIGHT_GROUP_VALVE_1
DO 6
RIGHT_GROUP_VALVE_2
DO 7
RIGHT_GROUP_VALVE_3
DO 8
RIGHT_GROUP_VALVE_4
SVCM Fault Indicators
Solenoid Valve
Valve 1
Valve 2
Valve 3
Valve 4
Valve 1
Valve 2
Valve 3
Valve 4
Fault Condition
Valve status read back is incorrect
J10 connector not connected
J11 connector not connected
2.8 Solenoid Valves
Group
Channel
80h
40h
20h
10h
08h
1
04h
02h
01h
79

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