How can i establish cyclic operation MODBUS TCP using MB_REDCL

cyanluna

Dear, experts.

Hi, I have to establish MODBUS TCP with VMS(Vently Nevada) via MB_REDCL.

PLC is 412-3H and CP is CP443-1. The CP is Client.

I want to read register form server(slave) every 1 second.

But i recevie a error code W#8304 or W#A083 form MB_REDCL.

Please show below the codein ob35( OB35 cyclicperiod is 50ms)
I had adjust the period time but not change situation.

Best Regards.
---------------------------------------------------------

O "CONTROL_DAT".DONE
O "CONTROL_DAT".ERROR
JCN modb

L 3
T "CONTROL_DAT".DATA_TYPE

L 834
T "CONTROL_DAT".START_ADDRESS

L 5
T "CONTROL_DAT".LENGTH

SET
= "CONTROL_DAT".WRITE_READ

L 1
T "CONTROL_DAT".UNIT

SET
= "CONTROL_DAT".ENQ //job trigger

modb : NOP0


CALL "MB_REDCL" , "IDB_Modbus_Client"
id_0_a :=
id_1_a :=
id_0_b :=
id_1_b :=
laddr_cp0 :=
laddr_cp1 :=
check_conn_cycle:=
use_all_conn :=
single_write :=
data_type_1 :=
db_1 :=
start_1 :=
data_type_2 :=
db_2 :=
start_2 :=
data_type_3 :=
db_3 :=
start_3 :=
data_type_4 :=
db_4 :=
start_4 :=
MONITOR :="CONTROL_DAT".MONITOR
REG_KEY :="LICENSE_DB".REG_KEY
ENQ :="CONTROL_DAT".ENQ
DATA_TYPE :="CONTROL_DAT".DATA_TYPE
START_ADDRESS :="CONTROL_DAT".START_ADDRESS
LENGTH :="CONTROL_DAT".LENGTH
WRITE_READ :="CONTROL_DAT".WRITE_READ
UNIT :="CONTROL_DAT".UNIT
LICENSED :="CONTROL_DAT".LICENSED
BUSY :="CONTROL_DAT".BUSY
DONE :="CONTROL_DAT".DONE
ERROR :="CONTROL_DAT".ERROR
STATUS_0A :="CONTROL_DAT".STATUS_0A
STATUS_1A :="CONTROL_DAT".STATUS_1A
STATUS_0B :=
STATUS_1B :=
IDENT_CODE :="CONTROL_DAT".IDENT_CODE

A "CONTROL_DAT".ENQ
R "CONTROL_DAT".ENQ

A "CONTROL_DAT".DONE // for DONE = TRUE
JCN err

L "CONTROL_DAT".COUNT_DONE
+ 1
T "CONTROL_DAT".COUNT_DONE

JU end


err: A "CONTROL_DAT".ERROR // for ERROR = TRUE
JCN noer

L "CONTROL_DAT".COUNT_ERROR
+ 1
T "CONTROL_DAT".COUNT_ERROR

L "CONTROL_DAT".STATUS_0A
T "CONTROL_DAT".Save_STATUS_0A

L "CONTROL_DAT".STATUS_1A
T "CONTROL_DAT".Save_STATUS_1A

JU end

// save values of STATUS without ERROR = TRUE and without STATUS = A090 (status of AG_CNTRL)

noer: L W#16#A090
L "CONTROL_DAT".STATUS_0A
<>I
JCN c1a
T "CONTROL_DAT".Save_STATUS_0A_no_Error

c1a: L W#16#A090
L "CONTROL_DAT".STATUS_1A
<>I
JCN end
T "CONTROL_DAT".Save_STATUS_1A_no_Error

end: NOP 0

 Hello,

I have a question regarding above program.

At the above setting value, "CONTROL_DAT".WRITE_READ is set to TRUE. And the author told that he intended to read from remote server.

My understanding is that "CONTROL_DAT".WRITE_READ should be FALSE for read function.

Am I wrong?

Thanks

Wüstenräuber

Hi,
8304 means, that there is no connection between S7 and the communication partner. What is the status of the connection in NetPro?

Please note: A083 is also an error and the ERROR bit is TRUE. So, the first lines are TRUE and ENQ is set again and again. You could ask for BUSY additionally. Only if BUSY is FALSE, you set ENQ to TRUE.

What is the status of the Done_Counter and Error_Counter? Do you have any other error codes?

Wüstenräuber

 Dear,

I am not certain how I should process when neither DONE nor ERROR happened after an MB_REDCL call.

Should I call again MB_REDCL without rising trigger ENQ to get DONE, ERROR value?

Otherwise, should I wait for a moment and check whether DONE or ERROR bit is set without MB_REDCL repeated call, because previous unfinished MB_REDCL call reports its status to DONE and ERROR after its process execution?

Many thanks for your attention and help again.

Dear,

I have a question regarding the unit of "CONTROL_DAT".LENGTH parameter.

For example at the following parameter setting,

--------------------------------------

L 5

T "CONTROL_DAT".LENGTH

-----------------------------------

"CONTROL_DAT".LENGTH parameter is set "5".

Does it mean 5 BYTE or 5 WORD( 10 BYTE)?