AEG 381 D Specifications download pdf (Page 65)

D3.5 Speed optimization

The speed of the data transfer depends essentially on two criteria:

1. The enabled transfer functions in the command words and

2. The number of variables displayed on the indicated display page.

The transfer times can be multiplied by a bad transfer organization!

The following measures can be taken to speed up the data transfer:

You can change the refresh behavior of the PCS tasks with the AJ driver variable

(PCS maxi: [COM_MAXPLEN]). A small AJ number provides for short com-

munication cycles and thus for a fast interchange of the keys. Variables however,

take longer. A large AJ number includes many tasks in a communication cycle and

thus causes a fast refreshing of variables. Key transfers however, take longer. Take

note, that with a small AJ number, the key LED test for a short keystroke does not

function optimally since the erase action of the key is performed due to its high

priority before the LEDs can be read.

To 1.

Programmable controller program optimizations for the PCS 009/ 090/ 095:

Disable all functions not required in the command words via the programmable

controller program. Thereby, the response on data, which are always transferred,

is reduced.

 In addition, with data word 13 command word A, you can limit the number of

message words with the DW13 bits 0..3.

If for instance you require only 35 messages, it suffices to read the message

bits of 3 words. This can be adjusted by writing xxxxxxxx xxxx0011 to DW13.

Depending on need, this setting of the programmable controller can be changed

(dynamically) at any time.

 By setting bit 7 of DW13 to a logical 0 you disable the reading (transfer) of the

entire LED STATUS WORDS W10..11 for the PCS 009/ 090 and W24..25 for the

PCS 095.

 By setting bit 6 of DW13 to a logical 0 you block the reading (transfer) of the

display and memory behavior.

 Avoid frequent changing of the display text since this requires the transfer of

the status words 6 to 9.

 You can dynamically change the amount of transferred data with your pro-

grammable controller program.

If for instance, you want to realize a jog operation, go ahead as follows: disable

all functions as described above. Select jog operation text without variables.

After termination of the jog operation, the transfer functions are enabled again.

Communication

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AEG 381 D Specifications Page 65