PARAMETERIZABLE Special Module (PSM) Control Unit Component Description - GF54.21-D-5005TSA

Model 907 

with code ED5 (Parameterisable special module) 

Location in vehicle 

PSM function model 

Location 

The parameterizable special module (PSM) control unit (N26/15) is located in the driver seat box.

Function of parameterizable special module (PSM) control unit 

The PSM control unit is also used as an interface between the onboard electronics and the body electronics. Furthermore, it is possible to parameterize the PSM control unit to control vehicle functions or to create separate functions for the vehicle. Various modules are available to the user for this, such as a PLC software, an arithmetic unit and various interfaces (digital inputs and outputs, bus systems). In addition to the modules, the so-called signal pool is an important element for the parameterization of the PSM control unit. The signal pool consists of an extensive collection of variable, the so-called "signals". Each signal has an unique signal ID via which the signal can be referenced.

The signal lists in the attachment can be used to identify the information the signal contains ("Description" column) and how large the signal is ("Signal type" column). The majority of the signals are of the "bit" data type, although other data types also exist, which are required e.g. for analog values or the arithmetic unit.

On one hand, the modules populate the signals with values. Example: The "Inputs" module fills the "MFE 1" (multifunction input 1) signal with the current value of the input (1: 1 correlation).

On the other hand, the modules can read out and process the values of the signals. Any number of modules can access the signal and read out its value (1: n correlation).

For example, the "Outputs" module can read out the "MFE 1" signal and use it to actuate the multifunction outputs MFA1 and MFA2. At the same time, the signal "MFE 1" can be read and processed by the PLC. Information can therefore be exchanged between the modules via the signal pool.

The function is described via the modules that are required for the function. The parameterization of the individual modules is always the same and takes place in three steps:

1. Setting the properties of the module, if necessary
2. Assigning an appropriate signal ID to the required internal inputs of the module.
3. Setting the internal input (filter etc.), if necessary

As soon as all the necessary modules are parameterized, the desired overall function is available. The individual modules are combined into an overall system via the assignment of signal IDs from the signal pool to the relevant internal inputs of the modules.