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CJ1-H/CJ1M CPU Unit Ver. 3.0 Upgrades Section 1-4
1-4-1 Function Blocks (FB)
Unit Ver. 2.0 or Earlier Earlier Units did not support function blocks (FB).
Unit Ver. 3.0 or Later Function blocks (FB) conforming to IEC 61131-3 are supported. Use of func-
tion blocks is determined by the user.
Note IEC 61131-3 is an international standard for programmable logic
controllers (PLC) established by the International Electro-technical
Commission (IEC). This standard is divided into seven parts, of
which Part 3 Programming Languages (IEC 61131-3) provides reg-
ulations for programming PLCs.
Function blocks can be created with CX-Programmer Ver. 5.0 or higher by the
user and pasted into normal programs. The standard function blocks provided
by OMRON in the OMRON FB Library can also be pasted into normal pro-
grams. Function blocks enable standard processing to be simply inserted into
a program as a single unit. Function blocks provide the following features.
• Function block algorithms can be written using ladder programming or
structured text (see note).
Note Structured text is a high level textual language designed for industrial
control (primarily PLCs) stipulated in IEC 61131-3. The structured
text supported by CX-Programmer Ver. 5.0 conforms to IEC 61131-1.
• A single function block that has been created can be stored in a library for
easy reuse of standard processing.
• Programs that contain function blocks (ladder programming or structured
text), can also be uploaded or downloaded in the same way as normal
programs that do not contain function blocks. Tasks that include function
blocks, however, cannot be downloaded in task units (although they can
be uploaded).
• Array (one-dimensional) variables are supported, making it easier to han-
dle data specific to an application.
1-4-2 Serial Gateway (Converting FINS to CompoWay/F Via Serial Port)
Unit Ver. 2.0 or Earlier Temperature Controllers, Digital Panel Meters, and other CompoWay/F-com-
patible OMRON Components previously could be accessed by sending user-
specified CompoWay/F commands from the PLC. This required, however, the
use of a Serial Communications Board/Unit protocol macro, execution of the
PMCR(260) instruction in the ladder program of the CPU Unit on the same
PLC, and implementation of the standard system protocol (CompoWay/F
Master). The use of protocol macros prevented access across networks.
New instructions
added
TXDU(256) and RXDU(255) instructions (sup-
port no-protocol communications with Serial
Communications Units with unit version 1.2 or
later)
1-4-6
Model conversion instructions: XFERC(565),
DISTC(566), COLLC(567), MOVBC(568), and
BCNTC(621)
Special function block instruction: GETID(286)
Additional instruc-
tion functions
TXD(236) and RXD(235) instructions (support
no-protocol communications with Serial Com-
munications Boards with unit version 1.2 or
later)
Function Section
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