PLC Programming

Appendix G: Siemens Import
BE, BEA, BEB
BLD, NOP, ***
UW, OW, XOW
KEW, KZW, KZD
SLW, SRW, SLD, RRD, RLD
SPA=, SPB=
SPZ=, SPN=, SPP=, SPM=
TAK
D, I
Most of the formal operand commands
Unconvertible Commands
U, UN, O, ON, S, R, = with the following bit operands: Timer and counter bits (T0.0, C0.0)
L, T with the following operand ranges: Q (expanded periphery)
LC with the following operands: T, C
SV, SS, R, FR with the following operands: T
FR with the following operands: C
Formal operand commands for starting, resetting and releasing timers
All commands with operands from the ranges BA, BB, BS, BT (operating system data).
SPA, SPB with the following operands: OB (works only with certain S5's and certain OBs )
BA, BAB with the following operands: FX
E, EX with the following operands: DB, DX
STP, STS, STW
DEF, DED, DUF, DUD
SVW, SVD
SPO=, SPS=, SPR
AS, AF, AFS, AFF, BAS, BAF
ENT
SES, SEF
B with the following operands: DW, MW, BS
LIR, TIR, LDI, TDI, TNW, TXB, TXW
MAS, MAB, MSA, MSB, MBA, MBS
MBR, ABR
LRW, LRD, TRW, TRD
TSG
LB, TB, LW, TW with the following operands: GB, GW, GD, CB, CW, CD
ACR, TSC
BI
SIM, LIM
If you examine the commands that cannot be converted you will see that they are generally special
commands that are only available on certain CPUs. The standard commands that cannot be
converted to IEC are: loading BCD coded timer or counter values (LC T, LC C), timer types SV and
SS, and resetting timers.
Data Blocks
STEP5 data blocks are converted into POUs (Program Organization Units) that have a header but no
code. This is convenient if the data blocks are used as normal variable ranges but inconvenient if
attempts have been made to manually implement concepts like instance data blocks in the STEP5
program.
Other Problems when Importing from STEP5
CoDeSys V2.3 10-77