Statement List (STL) - DCE FEL ČVUT v Praze

Program Control Instructions
10.16 MCR( Save RLO in MCR Stack, Begin MCR
Format
Description
Important Notes on Using MCR Functions
MCR(
MCR( (open an MCR area) saves the RLO on the MCR stack and opens a MCR
area. The MCR area is the instructions between the instruction MCR( and the
corresponding instruction )MCR. The instruction MCR( must always be used in
combination with the instruction )MCR.
If RLO=1, then the MCR is "on." The MCR-dependent instructions within this MCR
zone execute normally.
If RLO=0, then the MCR is "off."
The MCR-dependent instructions within this MCR zone execute according to the
table below.
Instructions dependent on MCR Bit State
Status word
Signal State
of MCR
= S , R T , T
T
0 ("OFF") Writes 0.
Does not write. Writes 0.
(Imitates a relay that (Imitates a relay that (Imitates a component
falls to its quiet state remains in its current that produces a value
when voltage is state when voltage is of 0 when voltage is
removed.)
removed.)
removed.)
1 ("ON") Normal processing Normal processing Normal processing
The MCR( and )MCR instructions can be nested. The maximum nesting depth is
eight instructions. The maximum number of possible stack entries is eight. Execution
of MCR( with the stack full produces a MCR Stack Fault (MCRF).
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - 0 1 - 0
Statement List (STL) for S7-300 and S7-400 Programming
10-20 A5E00706960-01