Functional Scope Of Logic Functions (PLC), PSM, Function - GF54.21-D-3008TSB

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) 

Function overview 

The parameterizable special module (PSM) control unit (N26/16) provides functions of the programmable logic controller (PLC). Using these software functions, the customer can realize simple logical operations between signals in the parameterizable special module's signal pool.

The PLC functions can be coded, i.e. the input signals of the PLC can be freely selected by the customer from the signal pool.

For some blocks, it is also possible to set parameters such as thresholds and times.

All logic function blocks with the following functions with quantity: 

• Logic block 224
• Timer block 84
• Counter block 28
• Flip-flop block 56
• Threshold switches 56
• Hysteresis block 28
• Value tables 56
• Constants 224

Logic function blocks 

The logic function blocks are subdivided into 28 identically structured groups.

Processing takes place sequentially in groups by ascending group number.

After a group has been processed, the results of the processing are available in the signal pool and can be used further by one of the subsequent groups.

Cycle times of the configuration blocks 

• Logic 20 ms
• Arithmetic unit 20 ms
• Multifunction outputs 10 ms
• Signal outputs 20 ms

Description of group 

Every group can be activated individually.

One group comprises the following function blocks:

• 1 hysteresis block
• 2 threshold switches
• 8 logic blocks
• 2 flip-flops
• 3 timers
• 1 counter
• 2 value tables
• 8 constants

The assignment of the input signals and the configuration of the function blocks take place via diagnosis.

The functions of the individual function blocks are described in the following documents:

• PSM logic functions, hysteresis block function
• PSM logic functions, threshold switch function
• PSM logic functions, logic block function
• PSM logic functions, flip-flop block function
• PSM logic functions, timer block function
• PSM logic functions, counter block function
• PSM logic functions, value table function
• PSM logic functions, constants function

Filter function 

The filter functions for various inputs of the function blocks are constructed identically, but can be coded individually.

A filter block is always active. If one or more filter parameter bits are set (where state does not equal "0"), the corresponding filter signal is also evaluated as an input signal (logical "AND").

Filter signals 1 to 3 have a special position, as they represent the non-inverted outputs of logic blocks and are therefore variable in their configuration.

Filterbit 8 If filter bit 8 is set, the logically inverted input signal is used.

No.	Filter	Description of output
1	Group 12 Logikblock1 logic block 1 output A	Observes the state of output A (non-inverted output) of group 12 logic block 1. Logikblock 1.
2	Group 12 Logikblock 2 logic block 2 output A	Observes the state of output A (non-inverted output) of group 12 logic block 2. Logikblock 2.
3	Group 12 Logikblock 3 logic block 3 output A	Observes the state of output A (non-inverted output) of group 12 logic block 3. Logikblock 3.
4	CiA447 awake	Bit is set if CiA447 CAN is active.
5	Circuit change, circuit 15 R to circuit 15	Terminal 15 Bit is set with a circuit change from circuit 15 R to circuit 15; reset takes place automatically after Terminal 15 3 PLC call cycles.
6	No overtemperature	The bit is set provided no overtemperature is detected in the PSM.
7	Terminal 58	The bit is set as long as the circuit 58 signal is not equal to Terminal 58 0.
8	Invert input signal	The evaluation of the input signal is inverted.
9	CAN fault	The bit is set as long as the control unit is operating in "limp-home mode".
10	No undervoltage	There is no undervoltage.
11	Terminal 61	Function for "Engine running".
12	Terminal 15	Function as from "Ignition ON".
13	Terminal 15 Circuit 15 R	Function as from "Ignition key at radio position".
14	Terminal 15 Circuit 15 C	Function as from "Key in ignition".
15	Central locking system (CL [ZV]) open	The CL [ZV] status does not equal "Externally locked".
16	Run-on time active	Function as long as at least one reason for the ECU remaining active (incl. run-on time) is active.

Logic configuration area 

The properties of the function blocks are compiled and configured in their own area within the logic configuration block.

Overview of system components for parameterizable special module (PSM)

GF54.21-D-9998TSB