In the length word the handling blocks (SEND, RECEIVE) store the already transferred
data of the current order, i.e. the received data amount for receiving orders, the sent data
amount for sending orders.
Describe: - Per SEND, RECEIVE during the data transfer. The length word is calculated
from: current transfer amount + amount of already transferred data
Delete: - Per overwrite res. with every new SEND, RECEIVE, FETCH. If the bit "order
ready without error" res. "Data fetch/data transition ready" is set, the "Length
word" contains the current source res. destination length. If the bit "order
ready with error" is set, the length word contains the data amount transferred
before the failure occurred.
The following section lists important status and error messages of the CPU that can
appear in the "Indicator word". The representation is in "HEX" patterns. The literal X
means "not declared" res. "irrelevant"; No. is the error number.
X F X A - The error index "F" shows, that the according order is not defined on the CP.
The state index "A" causes a block of this order (for SEND/FETCH and
RECEIVE).
X A X A - The error index "A" shows that the connection of the communication order is
not (yet) established. Together with the state index "A" SEND, RECEIVE and
FETCH are blocked.
X 0 X 8 - The connection has been established again (e.g. after a CP reboot), the
SEND order is released (SEND-communication order).
X 0 X 9 - The connection has been established again, the RECEIVE order is released
(RECEIVE-communication order).
X 0 2 4 - SEND has been worked off without errors, the data was transferred.
X 0 4 5 - RECEIVE was successful, the data arrived at the AG.
X 0 X 2 - The SEND-, RECEIVE-, READ- res. WRITE order is still running. At SEND the
partner is not yet ready for RECEIVE or vice versa.
Messages at SEND
State at H1 Prio 0/1 Prio 2 Prio 3/4
State at TCP/IP Prio 1 Prio 2 Prio 3
after reboot 0 A 0 A 0 A 0 A 0 0 0 8
after connection start X 0 X 8 X 0 X 8 .....
after initial impulse X 0 X 2 X 0 X 2 X 0 X 2
ready without error X 0 2 4 X 0 2 4 X 0 2 4
ready with error X No X 8 X No X 8 X No X 8
after RESET X D X A X D X A X D X 8
Length word Byte 2 and
Byte 3
Status and error reports
Important indicator word
states
VIPA SPEED7
System Blocks
Fetch/Write Communication > SFC 230 ... 238 - Page frame communication
HB00 | OPL_SP7 | Operation list | en | 18-30 894
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