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Main terminal station, back-up terminal station and general station
When power is applied to each S20LP-station, one station must have station address number 1.
The station of station number 1 becomes the main terminal station. The station of station
number 2 becomes back-up terminal station. Normally stations, except station number 1, become
the general stations. The main terminal station controls total timing of the S20LP network. If
main terminal station is down, back-up terminal station (station number 2) becomes main
terminal station on condition that the back-up enable flag is ON. If the back-up enable flag is
OFF, back-up terminal is general station. If both the station of station number 1 and 2 is down,
all stations become general station.
To be effective back-up terminal station, the address (1F44H) on the S20LP dual port memory
must be set ON. To set the S20LP dual port memory, use the write instruction. Detailed
information of write instruction see “T-series Instruction Set (Ladder, SFC)” (UM-TS03***-
E004).
Setting the "data send block" (by S-LS)
On each station, the "data send block" is prespecified by using the S-LS. This setting is made by
entering the starting addess and the size (number of send words). On a station, up to two "data
send blocks" can be specified. (see Section 3.3)
I/O allocation and network assignment (by T-PDS)
On each T2N/T3H, the I/O allocation for S20LP-station and the network assignment are
necessary. By using the T-PDS's I/O allocation function, allocate the S20LP-station as "TL-S"
(T3H) or E/S (T2N). And by using the T-PDS's Network assignment function, assign (set
"LINK" or "GLOBAL") the Link registers (W) to the S20LP-station's common memory (from 0
to 2048), Block by Block. (see Section 3.2)
Block 1: W0000 to W0063 Block 17: W1024 to W1087
Block 2: W0064 to W0127 Block 18: W1088 to W1151
Block 3: W0128 to W0191 Block 19: W1152 to W1215
Block 4: W0192 to W0255 Block 20: W1216 to W1279
Block 5: W0256 to W0319 Block 21: W1280 to W1343
Block 6: W0320 to W0383 Block 22: W1344 to W1407
Block 7: W0384 to W0447 Block 23: W1408 to W1471
Block 8: W0448 to W0511 Block 24: W1472 to W1535
Block 9: W0512 to W0575 Block 25: W1536 to W1599
Block 10: W0576 to W0639 Block 26: W1600 to W1663
Block 11: W0640 to W0703 Block 27: W1664 to W1727
Block 12: W0704 to W0767 Block 28: W1728 to W1791
Block 13: W0768 to W0831 Block 29: W1792 to W1855
Block 14: W0832 to W0895 Block 30: W1856 to W1919
Block 15: W0896 to W0959 Block 31: W1920 to W1983
Block 16: W0960 to W1023 Block 32: W1984 to W2047
T2N/T3H accesses the common memory only for the assigned Blocks. (This "Block" and
S20LP's "Data send block" are different.)
"LINK" is normal assignment setting. "GLOBAL" is the setting for multi layers Scan
transmission. (effective only in T3H)