OpBCD Statement

Converts a two-digit decimal value into a binary-coded decimal (BCD) value and outputs it to the specified byte port.

Syntax
OpBCD portNumber, outData [, Forced]

Parameters

portNumber

Specify the output byte of I/O. Where the portNumber selection corresponds to the following outputs:

Portnum	Outputs
0	0-7
1	8-15
2	16-23
3	24-31
...	...

outData

Specify the output pattern for the output group specified by port number as an integer value from 0 to 99. The 2nd digit (called the 1's digit) represents the lower 4 outputs in the selected group and the 1st digit (called the 10's digit) represents the upper 4 outputs in the selected group.

Forced

Optional. Usually omitted.

Description
OpBCD simultaneously sets 8 output lines using the BCD format. The standard and expansion user outputs are broken into groups of 8. The portNumber parameter for the OpBCD instruction defines which group of 8 outputs to use where portNumber = 0 means outputs 0 to 7, portNumber = 1 means outputs 8 to 15, etc.

Once a port number is selected (i.e. a group of 8 outputs has be selected), a specific output pattern must be defined. This is done in Binary Coded Decimal format using the outdata parameter. The outdata parameter may have 1 or 2 digits. (Valid entries range from 0 to 99.) The 1st digit (or 10's digit) corresponds to the upper 4 outputs of the group of 8 outputs selected by portNumber. The 2nd digit (or 1's digit) corresponds to the lower 4 outputs of the group of 8 outputs selected by portNumber.

Since valid entries in BCD format range from 0 to 9 for each digit, every I/O combination cannot be met. The table below shows some of the possible I/O combinations and their associated outnum values assuming that portNumber is 0.

Output Settings (Output number)

Outnum Value	7	6	5	4	3	2	1	0
01	Off	Off	Off	Off	Off	Off	Off	On
02	Off	Off	Off	Off	Off	Off	On	Off
03	Off	Off	Off	Off	Off	Off	On	On
08	Off	Off	Off	Off	On	Off	Off	Off
09	Off	Off	Off	Off	On	Off	Off	On
10	Off	Off	Off	On	Off	Off	Off	Off
11	Off	Off	Off	On	Off	Off	Off	On
99	On	Off	Off	On	On	Off	Off	On

Note that the Binary Coded Decimal format only allows decimal values to be specified. This means that through using Binary Coded Decimal format it is impossible to turn on all outputs with the OpBCD instruction. Please note that the maximum value for either digit for outnum is “9”. This means that the largest value possible to use with OpBCD is “99”. In the table above it is easy to see that “99” does not turn all Outputs on. Instead it turns outputs 0, 3, 4, and 7 On and all the others off.

Notes

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• Difference between OpBCD and Out

  The OpBCD and Out instructions are very similar in the SPEL+ language. However, there is one major difference between the two. This difference is shown below:

• The OpBCD command sets the higher-order 4 bits and lower-order 4 bits of a specified 8-bit port on or off using two-digit BCD format. The state of the 4 bits cannot be set from &B1010 to &B1111, which exceeds 9 (&B1001).

• The Out command outputs the output data value unchanged to the 8-bit port.

  Example: Out 8, &hFF 'Turns ON all bits of port number 8 (64 to 71).

• Output bits Configured as Remote:

  If an output bit which was set up as remote is specified to be turned on by OpBCD, an error will occur. Remote output bits are turned On or Off automatically according to system status. For more information regarding remote, refer to the following manual:
  "Epson RC+ User’s Guide"

  The individual bits for the remote connector can be set as remote or I/O from [Setup]-[System Configuration]-[Controller]-[Remote Control] panel.

• Outputs and When an Emergency Stop Occurs:

  The Controller has a feature which causes all outputs to go off when an E-Stop occurs. This feature is set or disabled from the [Outputs Off during emergency stop] checkbox in the [Setup]-[System Configuration]-[Controller]-[Preferences].

• Forced Flag

  This flag is used to turn On the I/O output at Emergency Stop and Safety Door Open from NoPause task, NoEmgAbort task (special task using NoPause or NoEmgAbort at Xqt), or background tasks.

  Be sure that the I/O outputs change by Emergency Stop and Safety Door Open when designing the system.

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See Also
In, InBCD, MemOff, MemOn, MemSw, Off, On, Oport, Out, Sw, Wait

OpBCD Function Example
The example below shows main task starting a background task called “iotask”. The “iotask” is a simple task to flip flop between turning outputs 1 & 2 on and then outputs 0 and 3 on. When 1 & 2 are turned on, then 0 & 3 are also turned off and vice versa.

Function main
    Xqt 2, iotask
    Go P1
    .
    .
    .
Fend

Function iotask
    Do
        OpBCD 0, 6
        OpBCD 0, 9
        Wait 10
    Loop
Fend

Other simple examples from the command window are as follows:

> OpBCD 1,6	     'Turns on Outputs 1 and 2
> OpBCD 2,1	     'Turns on Output 8
> OpBCD 3, 91     'Turns on Output 24, 28, and 31