Simatic 505 SoftShop
6 - Programming
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117
Changing Ladder Mode
Without S-memory configured, the
LADDERS
field is the only option
for changing program mode.
Freeze
places the controller in PROGRAM FREEZE mode. All outputs
are frozen in their current states. However, intelligent I/O modules still
can update outputs.
1.
To select PROGRAM FREEZE mode, Click on the Freeze
button on the PLC Operations dialog box. The following
message appears,
Stop the PLC with outputs frozen?
Select
either YES or NO.
Prog_Off
places the controller in PROGRAM OFF mode. Discrete
outputs are set to zero, and all word outputs are frozen. However,
intelligent I/O modules still can update outputs.
1.
To select PROGRAM OFF mode, Click on the Prog_Off button
on the PLC Operations dialog box. The following message
appears,
Stop the PLC with outputs cleared?
Select either
YES or NO.
When you elect to go to PROGRAM OFF mode, you receive the message, Stop the
PLC with outputs cleared? Select either YES or NO.
Intelligent I/O modules (e.g., the 386/ATM module, the Programmable BASIC
module, the Servo Axis module, or the High Speed Pulse Input module) can update
outputs even when the controller is in PROGRAM mode, if your code permits.
If an intelligent I/O module writes directly to an image register point, its write
takes precedence even when PGMFRZ/PGMOFF is in effect. This could cause
unexpected control action, resulting in death or serious injury to personnel, and/or
damage to equipment.
Do not write directly to output image register points from an intelligent I/O
module. Instead, write to a control relay or V-memory location and have your RLL
program copy this location to the output point.
Run
places the controller in RUN mode, beginning execution of the
ladder program.
1.
To select PROGRAM RUN mode, Click on the
RUN
button on
the PLC Operations dialog box. The following message
appears:
Run PLC?
Select either YES or NO.
Changing Loop Mode
When you select Loop Mode, you have the following options available.
NOTE
Your loop card cannot be in PROGRAM mode while the discrete
CPU is in RUN mode.
Prog
places the loop card in PROGRAM mode, and control blocks are
neither running nor being queued for running.
1.
To select LOOP PROGRAM mode, Click on the
Prog
button
on the PLC Operations dialog box. The following message