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

Model 907

with code ED5 (Parameterisable special module)

Function overview

The parameterizable special module (PSM) provides functions of the programmable logic control (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; this means that the input signals of the PLC can be freely selected by the customer from the signal pool.

With 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 96
Timer block 12
Counter block 12
Flip-flop block 24
Threshold switch 24
Hysteresis block 12
Value tables 12
Constants 60

Logic function blocks

The logic function blocks are subdivided into 12 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

Using the PLC configuration tool 1, a corresponding coding string can be generated for the data entry of the configuration blocks.

Description of logic configuration block

Every logic configuration block consists of 4 identically constructed groups with various function blocks.

Description of group

Every group can be activated individually.

One group comprises the following function blocks:

One hysteresis block
2 threshold switches
8 logic blocks
2 flip-flops
One timer block
One counter
One value table
5 constants

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

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

FILTER FOR INTERNAL INPUT

No.	Filter	Description of output
1	Group 12 logic block 1	Takes into consideration the state of
	output A	output A (non-inverted output) of group 12 logic block 1.
2	Group 12 logic block 2 output A	Takes into consideration the state of output A (non-inverted output) of group 12 logic block 2.
3	Group 12 logic block 3 output A	Takes into consideration the state of output A (non-inverted output) of group 12 logic block 3.
4	CiA447 active	Bit is set if CiA447 CAN is active.
5	Terminal change from terminal 15R to terminal 15	Bit is set with a change of terminal from terminal 15R to terminal 15; the reset reverts automatically after 3 PLC polling cycles.
6	No overtemperature	The bit is set provided no overtemperature is detected in the PSM.
7	Terminal 58	The bit is set provided the terminal 58 signal is not equal to "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	Terminal15R	Function as from "Ignition key at radio position".
14	Terminal15C	Function as from "Key in ignition".
15	Central locking (CL) open	The CL 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-9998TSA