HIMA HIMatrix Series Safety Manual

8 Safety-related Aspects of the User Program HIMatrix
Page 54 of 72 HI 800 023 E Rev. 1.01
; Executable code 2 with CRC 2.
3. Compare CRC 1 with CRC 2.
; The two CRCs are identical.
The generated code may be used for safety-related operation and for the system's
certification performed by the test authority.
8.2.5 Loading and Starting the User Program
A PES in the HIMatrix system cannot be downloaded until it is set to the STOP state.
Only one user program can be loaded into a given PES. The system monitors that the user
program is loaded completely. Afterwards, the user program can be started, i.e. the routine
begins to be processed in cycles.
i
HIMA recommends backing up project data, e.g., on a data storage medium, after loading a
user program into the controller.
This is done to ensure that the project data corresponding to the configuration loaded into
the controller remains available even if the PADT fails.
HIMA recommends a data back up on a regular basis also independently from the program
load.
8.2.6 Forcing
Forcing is the procedure by which a variable's current value is replaced with a force value.
The current value of a variable is assigned from one of the following sources:
 a physical input
 communication
 a logic operation.
When a variable is being forced, its value is defined by the user.
Forcing is used for the following purposes:
 Testing the user program; especially under special circumstances or conditions that
cannot otherwise be tested.
 Simulating unavailable sensors in cases where the initial values are not appropriate.
WARNING
Physical injury due to forced vaules is possible!
 Only remove existing forcing restrictions with the consent of the test authority.
 Only force values after receiving consent from the test authority responsible for
the final system acceptance test.
When forcing values, the person in charge must take further technical and organizational
measures to ensure that the process is sufficiently monitored in terms of safety. HIMA
recommends to set a time limit for the forcing procedure, see below.
NOTE
Use of forced values can disrupt the safety integrity!
 Forced value may lead to incorrect output values.
 Forcing prolongates the cycle time. This can cause the watchdog time to be
exceeded.
 Forcing is only permitted after receiving consent from the test authority respon-
sible for the final system acceptance test.

HIMA HIMatrix Series Specifications

General

Brand	HIMA
Model	HIMatrix Series
Category	Controller
Language	English