GF54.21-D-2000H Signal Concept, PSM, Function

GF54.21-D-2000H Signal Concept, PSM, Function

- with CODE (ED5) Parameterizable special module (PSM)


- with CODE (ED8) Preinstallation for parameterizable special module (PSM)







Signal flow in PSM control unit, shown on model 906 with code (ED5) Parameterizable special module (PSM)
10 CAN B interface
12 Signal pool
13 Discrete inputs
14 Internal functions
15 Discrete outputs
16 CAN Body manufacturer interface
CAN-ABH Controller Area Network bus Class C (body manufacturer)
CAN B Controller area network bus class B (interior compartment) (CAN B)
N26/15 PSM control unit
X11 Diagnostic socket, 16-pin

Signal pool
The signals are collected in a signal pool and have the following inputs and outputs:
- Discrete inputs and outputs
- Internal functional units
- The CAN B and CAN body manufacturer interfaces
- The RS485 interface (model 639)

Each signal has a unique ID in the form of a signal number. Each signal has parameters which can be set (parameterized) via the Diagnosis Assistance System (DAS).

Signal pool input
Each signal has just one source.

Signal pool output
Each signal can be assigned to one or more outputs by means of parameterization and used internally. Individual signals may be dependent on other signals, e.g. Tml. 15.

Signal types
The following signal types exist:
- Bit information (e.g. Tml. 15)
- 1-byte information (e.g. V-signal (vehicle speed signal)), (0 to 255)
- 2-byte information (e.g. motor speed), (0 to 65 535)
- Multi-byte information as pointer (e.g. vehicle identification number (VIN))

Special signals
The following special signals exist:
- "Permanent LOW" signal, gives a logical "0" at the input at which the signal is applied.
- "Permanent HIGH" signal, gives a logical "1" at the input at which the signal is applied.
- "Inquiry deactivated", deactivates the inquiry of this input (e.g. conditions for working speed control (model 906).