5130, 5130B and 5230 Excavators, 784B, 785B, 785C, 789B, 789C, 793B and 793C Off-Highway Truck/Tractors and 992G, 994 and 994D Wheel Loaders Vital Information Management System (VIMS) Caterpillar


Interface Module

Usage:

793B 1HL


Illustration 1g00568237

Table 1
Contact Description of Interface Module Connector(1) 
No.  Function  Type 
+Battery (+24 DCV)  Power Input 
Ground  Ground 
PWM 1  Sensor Input (PWM) 
PWM 2  Sensor Input (PWM) 
PWM 3   Sensor Input (PWM) 
Switch 1  Uncommitted Switch Input  
Switch 2  Uncommitted Switch Input  
Unused 
10  PWM 4   Sensor Input (PWM) 
11  PWM 5   Sensor Input (PWM) 
12  Switch 3  Uncommitted Switch Input  
13  Frequency 3
Programmable 
Sensor Input (Frequency) 
14  PWM 6   Sensor Input (PWM) 
15  PWM 7   Sensor Input (PWM) 
16  PWM 8   Sensor Input (PWM) 
17  Switch 4  Uncommitted Switch Input  
18  Switch 5  Uncommitted Switch Input  
19  Switch 6  Uncommitted Switch Input  
20  Switch 7  Uncommitted Switch Input  
21  CAT Data Link
Left +  
Input/Output 
22  CAT Data Link
Left -  
Input /Output 
23  CAT Data Link
Right +  
Input/Output 
24  CAT Data Link
Right -  
Input/Output 
25  Switch 8  Uncommitted Switch Input  
26  Sensor Power (8 DCV)  Output 
27  Sensor Power (5 DCV)  Output 
28  Frequency 1  Sensor Input (Frequency) 
29  Frequency 2
Programmable  
Sensor Input (Frequency) 
31  Solenoid 1  Driver
Output 
32  Switch 9  Switch Input
24 VDC 
33  Solenoid 2  Driver
Output 
37  Harness Code 0  Switch Input (programming) 
38  Harness Code 1  Switch Input (programming) 
39  Harness Code 2  Switch Input (programming) 
40  Harness Code 3  Switch Input (programming) 
(1) This connector is a 40 contact connector. Contacts not listed are unused.

There may be several interface modules on one machine. Each of these modules operate in a similar way. Different Module Identifiers (MID) are assigned to each module. This code is determined by the harness code connections. The Module Identifier (MID) for each interface module is listed here:

57 - VIMS Interface Module No. 1

58 - VIMS Interface Module No. 2

59 - VIMS Interface Module No. 3

60 - VIMS Interface Module No. 4

65 - VIMS Interface Module No. 5

66 - VIMS Interface Module No. 6

67 - VIMS Interface Module No. 7

68 - VIMS Interface Module No. 8

Note: The Module Identifier (MID) for the VIMS main module is No. 49.

Inputs/Outputs

CAT Data Link

The connector contacts of the CAT data link 21, 22, 23 and 24 provide a communication link with the other electronic control modules on the machine. The CAT data link is bidirectional. The bidirectional functionality allows the input/output of data between electronic control modules. The CAT data link permits the sharing of information such as engine oil pressure, machine codes and diagnostics. The interface module contains two identical CAT data links. The identical data links work independently of each other. The two data links are identified as the right or the left CAT data link. The interface module is connected in a loop with the VIMS main module. The loop provides two paths of communication for the VIMS modules. Two communication paths allow the VIMS modules to communicate even if the loop is broken by harness failures.

Inputs

The inputs describe the status of the machine systems. Switch inputs and sensor inputs are used by the interface module. Switches and harness wiring provide an open or ground to the switch inputs of the interface module. Sensors (frequency or PWM) and harness wiring provide a changing signal to the sensor inputs of the interface module.

Switch Input (+24 DCV)

The +24 DCV switch input (connector contact 32) monitors a +24 DCV circuit. The switch input will be either +24 DCV or the switch input will be open or floating. If the input is floating, a pull-down resistor in the interface module will pull this input to ground and the voltage will be at 0 volts.

Uncommitted Switch Inputs

The uncommitted switch inputs (connector contacts 6, 8, 12, 17, 18, 19, 20 and 25) provide the information about the machine systems. These inputs become dedicated to a specific function by the configuration software. The machine's Electrical System Schematic may be used to verify the function. The status of the switch input indicates a normal or abnormal system condition. The switch inputs receive machine system information from the following types of switches:

  • Pressure Switches

  • Temperature Switches

  • Flow Switches

  • Level Switches

  • Position Switches

The input of the interface module is either open (floating) or the input is connected to ground through the switch.

Switch Inputs (Harness Code)

The connector contacts 37 through 40 are the harness code inputs. The Harness code inputs can be used to assign a unique module identification code to the individual interface modules. This is necessary because there can be multiple interface modules on one machine. The module identification code identifies the interface module that is currently communicating with the VIMS main module. The combination of grounded harness code inputs and open harness code inputsdetermine the unique module identification code for the interface module.

Sensor Inputs (Frequency)

An AC signal that usually represents the rotational speed of a machine component is present at each frequency sensor input, connector contacts 13, 28 and 29. The suspension cylinder pressure sensor is the exception. The suspension cylinder pressure sensor generates a frequency that is proportional to the pressure in the suspension cylinder. For example, the ground speed , the engine speed sensor and the suspension cylinder pressure sensors provide an AC signal of varying frequency to the interface module. The interface module measures the frequency (Hz) of the AC signals. The resulting speeds are sent to the main module over the CAT data link. The main module shows this information on the speedometer/tachometer module. The main module may also show this information on the message center display. Connector contact 28 (frequency 1) is used only with a magnetic type sensor. The pull-up voltage is zero. The functionality of connector contacts 29 ("frequency 2") and 13 ("frequency 3") are programmable in the VIMS configuration software. The configuration software can be programmed for either magnetic sensors (sine wave) or powered sensors (square wave). The pull-up voltage is 7 ± 1 DCV on frequency inputs that are used with suspension cylinder pressure sensors.

Sensor Inputs (PWM)

The PWM sensor inputs at connector contacts 3, 4, 5, 10, 11, 14, 15 and 16 receive PWM signals that are representing the present condition of a machine system. PWM sensors provide temperature, pressure and level information of machine systems. The interface module measures the duty cycle of the PWM signal, which represents the measured information. This PWM information can be sent to the main module over the CAT data link. The main module uses this information to monitor machine systems. Then alert the operator of any abnormal conditions.

Outputs

Solenoid Output

The solenoid (driver) outputs connector contacts 31 and 33 allow the interface module to cause action. An example of this action could be energizing a solenoid or sounding the action alarm.

Voltage Output (Sensor Power)

This output provides a regulated power source to the PWM sensors. There are two voltage outputs on this module. A regulated +8 DCV sensor power source connector contact 26 and a regulated +5 DCV sensor power source connector contact 27.

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