Specifications

137
Data Type Structure Section 16-4
16.4.3 Additional Functions
In addition to the random read and write access to PLC variables, a 12 byte memory
area is specified in the application description as a poll area.
The only marginal conditions regarding this memory area are that the PLC must be
able to access in bit-mode and the terminal in word-mode and the memory area
must be contiguous.
This poll area must point to the flag word area (MW).
Example: The cyclic poll area is set to MW’000,10 in the programming system.
Word address MW’ High-byte Low-byte
Word address +0 MW’000,10 Write coordination byte Reserved
Word address +1 MW’000,11 Message channel high-byte Message channel
low-byte
Word address +2 MW’000,12 Function key LEDs 1 to 4 LEDs 5 to 8
Word address +3 MW’000,13 Function key LEDs 9 to 12 LEDs 13 to 16
Word address +4 MW’000,14 Function key LEDs 17 to 20 LEDs 21 to 24
Word address +5 MW’000,15 Function key LEDs 25 to 28 LEDs 29 to 32
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Word address + 0 free free free DDF LM PL RQ ED free free free free free free free free
Word address + 1 serial message channel high-byte serial message channel low-byte
Word address + 2 LED1 LED1 LED2 LED2 LED3 LED3 LED4 LED4 LED5 LED5 LED6 LED6 LED7 LED7 LED8 LED8
on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing
Word address + 3 LED9 LED9 LED10 LED10 LED11 LED11 LED12 LED12 LED13 LED13 LED14 LED14 LED15 LED15 LED16 LED16
on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing
Word address + 4 LED17 LED17 LED18 LED18 LED19 LED19 LED20 LED20 LED21 LED21 LED22 LED22 LED23 LED23 LED24 LED24
on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing
Word address + 5 LED25 LED25 LED26 LED26 LED27 LED27 LED28 LED28 LED29 LED29 LED30 LED30 LED31 LED31 LED32 LED32
on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing on/off flashing
To switch LED 1 on, the value -32768 ( 0x8000 ) must be entered in the address +2.
However, the ASCII plain text protocol does not transfer this value.
SOLUTION:
Enter -32767 ( 0x8001 ) instead of -32768. This will set the flash bit of LED 8 which
has no effect on the output.