EMCP3 Caterpillar

Discrete Input/Output Module

Usage:

[ OPTIONAL USE ]

The discrete input/output (I/O) module is not required.

The discrete input/output module is a device that can read 12 discrete inputs and operating eight relay outputs. The discrete input/output module can be mounted on the generator set package or mounted remotely in another location.

Inputs

The discrete input/output module has 12 inputs with four return channels. The inputs can be activated by either switching to a return or by switching to battery negative. Each of the inputs can be configured to signal one of many possible events. The Caterpillar Service Tool is used in order to configure the discrete input/output module inputs.

Inputs that generate a warning message will reset automatically whenever the input returns to a non-active state. Inputs that generate a shutdown message will continue until the input returns to a non-active state and a reset message is received by the module on the J1939 data link.

The input configuration parameters are shown in Table 1.

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Table 1
Configuration Parameters for Each Input
Setpoint Parameter	Range	Default
Input #inn Active State Configuration	Active Low Active High	Active State Low
Input #nn Time Delay	0 to 120 seconds	0
Input #nn SPN	Any SPN (see Table 2 supported by EMCP 3	N/A
Input #nn FMI	Any FMI supported by EMCP 3	N/A

Table 2 lists the "Suspect Parameter Numbers" (SPN) that the EMCP 3 supports for inputs and outputs. An SPN is an internationally recognized code that is assigned a specific meaning. For example, SPN 110 relates to the "Engine Coolant Temperature".

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Table 2
EMCP 3 Supported Suspect Parameter Numbers
SPN	SPN Description	Input	Output
38	Fuel Level-Secondary Tank	X	X
52	Engine After Cooler Temperature		X
82	Starting Air Pressure		X
94	Fuel Pressure		X
95	Fuel Filter Differential Pressure		X
96	Fuel Level (Primary Tank)	X	X
98	Engine Oil Level		X
99	Oil Filter Differential Pressure		X
100	Engine Oil Pressure		X
101	Crankcase Pressure		X
107	Air Filter Differential Pressure		X
110	Engine Coolant Temperature		X
111	Engine Coolant Level	X	X
137	Extinguisher System Pressure	X	X
167	Battery Charging System Voltage	X	X
168	Battery Voltage		X
171	Ambient Air Temperature		X
172	Inlet Air Temperature		X
173	Exhaust Temperature		X
174	Fuel Temperature		X
175	Engine Oil Temperature		X
190	Engine Over Speed		X
612	Generator Rotating Diode Failure		X
628	Voltage Regulator Failure		X
970	Emergency Stop Shutdown ⁽¹⁾		X
971	Engine Derate Overridden		X
1084	Generator Over excitation	X	X
1122	Generator Bearing Temperature #1		X
1124	Generator Winding Temperature #1		X
1125	Generator Winding Temperature #2		X
1126	Generator Winding Temperature #3		X
1237	Emergency Shutdown Override Mode Active Warning	X	X
1239	Ruptured Fuel Basin-Primary Tank	X	X
1383	Unexpected Engine Shutdown		x
1664	Engine Failure to Start Shutdown		X
2433	Right Exhaust Temperature		X
2434	Left Exhaust Temperature		X
2436	Generator Frequency		X
2440	Generator Voltage		X
2448	Generator AC Current		X
2452	Generator Reverse Power (kW)		X
2456	Generator Reactive Power (VAR)		X
2648	Service Interval Warning		X
4000	Air Shutoff Damper Close	X	X
4001	ATS in Normal Position	X	X
4002	ATS in Emergency Position	X	X
4003	Battery Charger Failure	X	X
4004	Generator Breaker Closed	X	X
4005	Utility Breaker Closed	X	X
4006	Engine in Cool Down		X
4007	Generator Control Not in Auto		X
4028	Earth Fault	X	X
4029	Earth Leakage	X	X
User Defined Input #1	Range 701-716	X
User Defined Input #2	Range 701-716	X
User Defined Input #3	Range 701-716	X
User Defined Input #4	Range 701-716	X
User Defined Input #5	Range 701-716	X
User Defined Input #6	Range 701-716	X
User Defined Input #7	Range 701-716	X
User Defined Input #8	Range 701-716	X
User Defined Input #9	Range 701-716	X
User Defined Input #10	Range 701-716	X
User Defined Input #11	Range 701-716	X
User Defined Input #12	Range 701-716	X

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⁽¹⁾	Input configured as "Emergency Stop Shutdown" (SPN 970) will not perform a shutdown when activated. Use only to create an event log message in the EMCP 3 if desired.

Outputs

The discrete I/O module has eight "Form C" relay outputs. Each output can be configured to signal one of many possible events. Each output can be configured for either general events or for specific events. The Cat ET Service Tool (CST) is used in order to configure the discrete I/O module outputs.

For general events, each output activates whenever any "Alarm Condition", "Shutdown Condition", or any combination of the two conditions exist.

For specific events, each output activates whenever the diagnostic message contains the SPN and Failure Mode Identifier (FMI) combination that matches the SPN and FMI combination that is programmed for that particular output.

The FMI defines the nature of the event, such as above range or below range. The FMI includes events such as high or low alarms, shutdowns, or condition exists.

The output configuration parameters are shown in table 3.

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Table 3
Configuration Parameters for Each Output
Set Point Parameter	Range
Output #nn SPN	Any SPN supported by EMCP 3
Output #nn Trigger Condition	Disabled
	Specific	Condition Exists Open Circuit Diagnostic High Shutdown High Warning Low Shutdown Low Warning Warning or Shutdown Warning, Shutdown, or Short Circuit Diagnostic
	General	Open Circuit Diagnostic Shutdown Warning Warning, Shutdown, or Short Circuit Diagnostic

Configuration Behaviors

The discrete I/O module exhibits the following configuration behaviors.

Maintains functionality with no loss in performance during single set point configuration
Maintains functionality with no loss in performance while communicating on the data link
Retains all configured values in non-volatile memory
Configured on the secondary data link (CAN2) using the CST.

Specifications

Table 4 lists the specifications for the input/output module.

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Table 4
Input/Output Module Specifications
Nominal Voltage	9 VDC to 32 VDC
Operating Voltage Range	12 VDC 24 VDC (external power supplies)
Ambient Operating Temperature	-40 degrees Celsius to 70 degrees Celsius
Output Relay Contact Ratings	2A @120 VAC 2A @ 30 VDC 2A @ 277 VAC