4. Communications
GEM80-400
Page 4-26
ALSPA GEM
80-400 SERIES CONTROLLERS TECHNICAL MANUAL
Issue 3 04/99
P-table
Bits 8 to 15
(J - tables)
Bits 0 to 7
(K-tables)
J/K-tables assigned.
P14 = 0020
0
3210
assigns the first 32 tables to J0 to J31
and K0 to K31
P15 = 3420
5210
3210
assigns the next 52 tables to J32 to
J83 and K32 to K83
P16 = 1002
1610
210
assigns the next 16 tables to J84 to
J99 and K84 to K99
P17 = 0048
0
7210
assigns the next 72 tables to J100 to
J171 and K100 to K171
4.5.4. Operation as a Control Port
Data table transfers occur only between user program scans, and the I-table is
also only examined between scans in the user-control mode. If a message is
received that is longer than the space allocated, the message is truncated and
a fault flag is set; see Chapter 9 for further information. The control port can be
operated in the free-running mode or the user-control mode and the user can
select either of these options.
4.5.4.1.
Free-Running Mode
When free-running mode is selected the controller cycles round the routes
indicated in the preset data to be in use and attempts a J/K exchange,
transmitting the quantity of locations requested in the P-table. If a valid reply is
not received after the system of retries has been exhausted, the route is
classified as failed and the corresponding bit in F10/F30 is set ON. In the event of
a tributary failing to communicate, the errors are not clocked up on a cyclic
basis but only after 8 complete scans of the remaining active tributaries, i.e. the
scan rate is one-eighth of its original rate. If a failed route recommences
communication, the F-table bit is set OFF and the route is no longer classified as
failed.
4.5.4.2.
User-Control Mode
User-control mode allows the user to vary the length of transmissions and to
dynamically select the next route for transmission. If flexible data tables are used
(P11/P31 = 3), the user may also select the tributary address for that route
dynamically. To initiate a message transfer on a route, proceed as follows:
(a)
Set the Tx message length in the I-table
(b)
If P11/P31 = 3 (flexible data tables), set the Tx address in the I-tables.
(c)
Set the transmit data in the appropriate K-tables.
(d)
Set the transmit flag for the route in the I-table - the message will be
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