User’s Manual 41
2. Expanded Functions
In addition to the standard bus connection type TOSLINE-S20 (here called S20), the
optical loop connection type TOSLINE-S20LP (here called S20LP) can be used with
the T3H. (SN325: T3H station module of S20LP)
By using the S20LP, high speed control-data linkage is available as same as the S20.
Furthermore, peer-to-peer communication between T3H’s becomes available via
S20LP.
• Up to two S20LP can be installed on a T3H. (S20LP and S20 total)
• The S20LP has 4 k words of scan transmission capacity.
The leading 2 k words of the scan memory can be assigned to T3H’s link register
(W). And the following 2 k words can be read/written by using XFER instruction.
• The S20LP does not have the scan healthy map. Therefore, SW128 to SW255 are
not used for the S20LP.
• The S20LP has the loop map which indicates loop connection status of each
station. This loop map can be read by using READ instruction.
• By using SEND and RECV instructions, any register data of a T3H can be sent to
other T3H, and any register data of other T3H can be read into a T3H, via S20LP.
(peer-to-peer communication)
NOTE (1) The S20LP is under development.
(2) For details of the S20LP, refer to the separate manual for S20LP.