Rockwell-automation 57C442 Data Highway Plus Interface Module Manual do Utilizador descarregar pdf (Página 26)

4-8

4.2.2 Application Programming

Read and write commands from the Data Highway Plus Interface

module are initiated from a BASIC application task by executing the

GATEWAY_CMD_OK@ function:

GATEWAY_CMD_OK@(status%, cmd_code%, slave_drop%, &

slave_reg$, master_var!, num_regs%)

where:

status is an integer variable representing the location where the

status resulting from the operation is stored. Refer to Appendix E for

a list of status values.

cmd_code is a variable name or expression of type integer

representing the Data Highway Plus command sent by the module.

The commands are described in section 4.2.4. Any other commands

result in a status of 1 (invalid operation) being returned.

slave_drop is variable name or expression of type integer containing

the destination station number (in decimal or hexadecimal). This is

the station number on your Data Highway Plus network. In the case

where off-link addressing is used, this is the address of the bridge

node on the local Data Highway Plus network. See section 4.2.6 for

more information.

slave_reg is a variable name or expression of type string that

specifies the starting register number on the target device. For

commands 3, 4 and 5, this is a logical address represented as an

ASCII string for PLC-3 and PLC-5 controllers. It can also be a 5-digit

octal number. For commands 1 and 2, this argument should be an

octal number. This field can also contain Data Highway Plus routing

information. Refer to section 4.2.6. For command 5 (Read-Modify-

Write), this argument can contain up to ten addresses separated by

commas. The address must exist at the target station.

master_var is a variable name or expression (usually via the BASIC

language VARPTR! function) of type double integer, representing

the physical address of the starting register on the Data Highway

Plus module to be read from/written to.

num_regs is a variable name or expression of type integer that

defines:

• for Word Range Read/Write (command 3 or 4), the number of

registers to be transferred, from 1 to 1000;

• for Read-Modify-Write (command 5), the number of addresses

to be written, in the range 1 to 10;

• for Unprotected Read/Write (command 1 or 2), the number of

registers to be transferred, from 1 to 100.

The GATEWAY_CMD_OK@ function will be true if the command was

successfullycompleted. If the function is false, the returned status will

be an error code. See Appendix E for the error codes returned by the

GATEWAY_CMD_OK@ function.

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 61 62

Comentários a estes Manuais

Sem comentários

Modely	Typ Dokumentu
907-DP74-0S01-00R	Uživatelský manuál COBY electronic 907-DP74-0S01-00R User's Manual, 1 stránky
DP-5588	Uživatelský manuál COBY electronic DP-5588 User's Manual, 36 stránky
DP1412	Uživatelský manuál COBY electronic DP1412 User's Manual, 1 stránky
DP350	Uživatelský manuál COBY electronic DP350 User's Manual, 1 stránky
DP500	Uživatelský manuál COBY electronic DP500 User's Manual, 1 stránky
DP5088	Uživatelský manuál COBY electronic DP5088 User's Manual, 1 stránky
DP702	Uživatelský manuál COBY electronic DP702 User's Manual, 1 stránky
DP710	Uživatelský manuál COBY electronic DP710 User's Manual, 1 stránky
DP848-128	Uživatelský manuál COBY electronic DP848-128 User's Manual, 1 stránky

Rockwell-automation 57C442 Data Highway Plus Interface Module Manual do Utilizador Página 26

Comentários a estes Manuais

COBY electronic Digitální fotorámečky uživatelské příručky

Rockwell-automation 57C442 Data Highway Plus Interface Module Manual do Utilizador Página 26

Comentários a estes Manuais

Manuais e produtos relacionados com Equipamento Rockwell-automation 57C442 Data Highway Plus Interface Module

COBY electronic Digitální fotorámečky uživatelské příručky