Specifications

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A-36
A LAUER driver
A4.4 Data transfer PCS 830.x I/O BUS
The PCS 830.3/31 uses for each channel (separately settable) 4
addresses respectively in the EZ/AZ area on the I/O bus. These addresses
have the following meaning (only for diagnosis purposes):
ADDRESS: base address +0
DIRECTION: writing (AZ)
-- presently not used
DIRECTION: reading (EZ)
-- presently not used
STATUS CHANNEL
ADDRESS: base address +1
DIRECTION: reading (EZ)
bit 7 = 1 (frame ready) - data interchange readiness!
bit 6 = 1 (fetch list) - cross-reference list transfer!
bit 5 = 1 (watchdog) - watchdog has been activated!
bit 4..0 presently not used
DIRECTION: writing (AZ)
-- reset during communication (software reset)
for exiting the menus (PCS 100)
DATA CHANNEL
ADDRESS: base address +2 and bass address +3 (word-by-word)
DIRECTION: reading (EZ) and writing (AZ)
COMMANDS PCS -> prog. contr.
DATA PCS <-> prog. contr.
The data transfer is managed by the enclosed PCSKOMM PB, so no
evaluation is required by the user. The indicated meanings are only rele-
vant for diagnosis purposes. However, attention must be paid that the
user program never accesses the base addresses +2, +3 of the corres-
ponding channel. Otherwise, correct communication between the PCS
operating console and the PCS 830.3/31 is not guaranteed anymore.
Consequences are e.g. stop of the programmable controller, corruption
of the programmable controller program and data.