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Introducing Function Blocks Section 1-4
Note The IEC 61131 standard was defined by the International Electro-
technical Commission (IEC) as an international programmable log-
ic controller (PLC) standard. The standard is divided into 7 parts.
Specifications related to PLC programming are defined in Part 3
Textual Languages (IEC 61131-3).
• A function block (ladder programming language or structured text (ST)
language) can be called from another function block (ladder programming
language or structured text (ST) language). Function blocks can be
nested up to 8 levels and ladder/ST language function blocks can be com-
bined freely.
1-4-2 Function Block Specifications
For specifications that are not listed in the following table, refer to the CX-Pro-
grammer Ver. 7.0 Operation Manual Function Blocks (W447).
Note The structured text (ST language) conforms to the IEC 61131-3 standard, but
CX-Programmer Ver. 5.0 supports only assignment statements, selection
statements (CASE and IF statements), iteration statements (FOR, WHILE,
REPEAT, and EXIT statements), RETURN statements, arithmetic operators,
logical operators, comparison functions, numeric functions, and comments.
Item Specifications
Model number WS02-CXPC1-E-V6
Setup disk CD-ROM
Compatible CPU Units CP-series CPU Units with unit version 1.0 or later
CS/CJ-series CS1-H, CJ1-H, and CJ1M CPU Units with unit version 3.0 or
later are compatible.
Device Type CPU Type
• CS1G-H CS1G-CPU42H/43H/44H/45H
• CS1H-H CS1H-CPU63H/64H/65H/66H/67H
• CJ1G-H CJ1G-CPU42H/43H/44H/45H
• CJ1H-H CJ1H-CPU65H/66H/67H
• CJ1M CJ1M-CPU11/12/13/21/22/23
CS/CJ/CP Series Function Restrictions
• Instructions Not Supported in Function Block Definitions
Block Program Instructions (BPRG and BEND), Subroutine Instructions
(SBS, GSBS, RET, MCRO, and SBN), Jump Instructions (JMP, CJP, and
CJPN), Step Ladder Instructions (STEP and SNXT), Immediate Refresh
Instructions (!), I/O REFRESH (IORF), ONE-MS TIMER (TMHH).
Compatible
computers
Computer IBM PC/AT or compatible
CPU 133 MHz Pentium or faster with Windows 98, 98SE, or NT 4.0 (with service
pack 6 or higher)
OS Microsoft Windows 95, 98, 98SE, Me, 2000, XP, or NT 4.0 (with service pack
6 or higher)
Memory 64 Mbytes min. with Windows 98, 98SE, or NT 4.0 (with service pack 6 or
higher)
Refer to the CX-Programmer Ver. 7.0 Operation Manual (W437) for details.
Hard disk space 100 Mbytes min. available disk space
Monitor
SVGA (800 × 600 pixels) min.
Note Use “small font” for the font size.
CD-ROM drive One CD-ROM drive min.
COM port One RS-232C port min.
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