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Technical equipment of TC600 PLC
59
TXV 138 08.02
10.4 Operational Modes
The PLC may operate in three basic modes.
The RUN mode is a common operational mode in which values of input
signals are scanned, operations given by the user program algorithm are
performed, and PLC outputs are set. The PLC transfers in the RUN mode
automatically after proper termination of the starting sequence. In the
course of the mode, letter G is shown on the display.
The HALT mode is an operational mode in which the user program is not
run and the PLC is in a defined state. The PLC transfers to the HALT mode
automatically when a critical error is evaluated during the starting sequence
or in the course of control and after termination of the SET mode.
If the PLC transfers to the HALT mode from the starting sequence, bi-
nary outputs remain blocked in the still state, analog outputs remain set to
zero and code of the error message is shown on the display.
If the PLC transfers in the HALT mode after termination of the SET
mode, binary outputs remain blocked in the still state, analog outputs remain
set to zero and letter H or an error message are is shown on the display.
Mode HALT evoked by termination of the SET mode can be terminated ei-
ther by the superior system or by turning off and on of the PLC power sup-
ply.
If the PLC transfers to the HALT mode in the course of control, binary
outputs are set in the still state and blocked, analog outputs are frozen in the
state in which they were in the moment of transferring to the HALT mode,
and an error message is shown on the display.
For transfer to the HALT mode controlled by the user see item 10.4.1.
The SET mode serves for setting of communication parameters, setting
of the time circuit, and control of activation of the source user program. En-
trance in the mode is controlled by the attendance persons at turning on of
the PLC power supply. In the course of the mode, binary outputs are
blocked in the still state, and analog outputs are set to zero. After termina-
tion of the SET mode, the PLC transfers automatically to the HALT mode.
Detailed description of setting of the PLC parameters is given in Article 4.5.
10.4.1 Change of Operational Modes
Transfer between RUN and HALT modes controlled by the attendance
persons is possible only using the superior system equipped with an inte-
grated development environment for programming of the Tecomat PLC's or
with a monitoring and controlling program. Transfer between the modes has
practical foundation only in the phase of debugging of the user program. In
general, it can be said that transfer between the modes if a device is con-
nected, especially modification of the PLC activity at transfer between the
modes, requires perfect knowledge of the controlled object as well as of the
PLC, and careful consideration of possible consequences.
When changing the PLC operational modes, some activities are per-
formed on the standard basis, and some can be performed optionally. In the
case that the change of the PLC mode is done using the PLC development
environment, optional activities at changing of the mode are a part of the
development environment menus.
10.4.2 Activities Performed at Changing of the PLC Mode on the
Standard Basis
In transfer from the HALT to RUN mode, the following is performed:
test of the user program integrity
check of software configuration given in the user program (see item
10.5.2)
running of the user program solving
In transfer from the RUN to HALT mode, the following is performed:
stopping of the user program solving
setting of outputs in a defined state
Mode RUN
Mode HALT
Mode SET
Transfer from the
HALT to RUN mode
Transfer from the
RUN to HALT mode