Parameterizable Special Module (PSM) Control Unit, Component Description - GF54.21-D-5005TSB
Model 447, 448
with code ED5 (Parameterisable special module)
with code XM7 (MOPF II)
Model 907, 910
with code ED5 (Parameterisable special module)
with code XJ4 (Modification year G4-I)
Location in vehicle, model 907
Location in vehicle, model 447
Location
The parameterizable special module (PSM) control unit (N26/16) is located in the driver's seat box.
PSM function model
Function of parameterizable special module (PSM) control unit
The parameterizable special module (PSM) control unit (N26/16) also serves as an interface between the on-board electronics and the electronics of the body. Furthermore, it is possible to parameterize the parameterizable special module (PSM) control unit (N26/16) to control functions of the vehicle or to create own 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 signal pool is an important element for parameterization of the parameterizable special module (PSM) control unit (N26/16). The signal pool consists of an extensive collection of variables, or "signals". Each signal has a unique signal ID via which the signal can be referenced.
The signal lists in the WIS Service Media (WSM) or BB Portal can be used to determine which information contains the signal ("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:
Setting the properties of the module, if necessary
Assigning an appropriate signal ID to the required internal inputs of the module.
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.