STL Language Netwrok

Dear STL Users,

I have one function block and in that I have one network with some STL code; I am very poor in STL. Anyone please can support to understand the below and what is "JC    M009" exactly ? 

OPN   "ACESYS_ANALOG_DB"
L     #NO
L     12
*I
SLW   3
LAR1
L     #Scaled_Value
T     DBD [AR1,P#0.0]
L     DBW [AR1,P#8.0]
L     #StatusToEcs
==I
JC    M009
L     #Scaled_Value
T     DBD [AR1,P#4.0]
L     #StatusToEcs
T     DBW [AR1,P#8.0]
L     #TempWord
T     DBW [AR1,P#10.0]
M009: NOP   0
 

Best Regards,

Ahmed

JC M009 = "Jump to jump label M009 if RLO = 1"

Dear ixo,

Thank you for your prompt help. Could you please also support to under stand the 1st part; what is the role of L12 here ? and what is the relation between L12 and #StatusToEcs ?

OPN   DB    15
L     #NO
L     12
*I
SLW   3
LAR1
L     #Scaled_Value
T     DBD [AR1,P#0.0]
L     DBW [AR1,P#8.0]
L     #StatusToEcs

Best Regards,

Ahmed

Hi

share the full program regarding those instructions to understand and explain your doubt 

OPN   "ACESYS_ANALOG_DB" // Open the data block
                         ----------------------------------------
L     #NO                // Load the value of the Interface
                            parameter #NO
                         ----------------------------------------
L     12                 // Load the integer value 12
                         ----------------------------------------
*I                       // Multiply both together
                         ----------------------------------------
SLW   3                  // Shift all bits to the left by 3 bits,
                         to create the byte address for the
                         pointer
                         ----------------------------------------
LAR1                     // Load the byte address into
                            Address Register 1 (AR1)
                         ----------------------------------------
L     #Scaled_Value      // Load the value of the Interface
                            parameter #Scaled_Value
                         ----------------------------------------
T     DBD [AR1,P#0.0]    // Transfer it to the data double word
                            with the address of the pointer
                         ----------------------------------------
L     DBW [AR1,P#8.0]    // Load the value of the data double
                            word with the address of the pointer
                            and a offset of 8 Bytes
                         ----------------------------------------
L     #StatusToEcs       // Load the value of the Interface
                            parameter #StatusToEcs
                         ----------------------------------------
==I                      // Compare they of equality
                         ----------------------------------------
JC    M009               // If equal, jump to the label mark M009