Basic Concepts for Programming an S7-200 CPU
4-12
S7-200 Programmable Controller System Manual
A5E00066097-02
Table 4-3 IEC 1131-3 Complex Data Types
Complex Data Types
Description Address Range
TON On-Delay Timer 1 ms T32, T96
10 ms T33 to T36, T97 to T100
100 ms T37 to T63, T101 to T255
TOF Off-Delay Timer 1 ms T32, T96
10 ms T33 to T36, T97 to T100
100 ms T37 to T63, T101 to T255
TP Pulse Timer 1 ms T32, T96
10 ms T33 to T36, T97 to T100
100 ms T37 to T63, T101 to T255
CTU Up Counter 0 to 255
CTD Down Counter 0 to 255
CTUD Up/Down Counter 0 to 255
SR Set Dominant
Bistable
--
RS Reset Dominant
Bistable
--
Data Type Checking There are three levels of data type checking: strong data
type checking, simple data type checking, and no data type checking.
Strong Data Type Checking In this mode, the parameter data type must match
the symbol or variable data type. Each formal parameter has only one data type
(except for overloaded instructions). For example, the IN parameter of an SRW
(Shift Right Word) instruction has the data type WORD. Only variables that are
assigned the WORD data type will compile successfully. Variables that are data
typed as INT are not valid for WORD instruction parameters when strong data type
checking is enforced.
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