
19 Display Programs for PLC Data and Messages
05.91
19.3 Messages
As far as the display concept is concerned, a differentiation is made between three types of
display:
•
PLC error messages
•
PLC operational messages
•
PLC message groups
Several bit fields are available to detect the messages (Section 19.3.4):
•
Channel-specific message bits
(DB 10 to DB 25, DW 6 to DW 11, active channels only)
•
Spindle-specific message bits
(DB 31,
DW K+3)
•
Axis-specific message bits
(DB 32,
DW K+3)
•
PLC-specific message bits
(DB 58,
DW 1 to DW 32)
The bit fields are allocated a dual function:
a) Actuation of NC functions (e.g. feed disable)
b) Actuation of messages
Channel-specific messages, dual function of message bits
FB
PLC MD
DW 11
DW 10
NC start
disable
General feed
disable
DB m
DW 6
General
feed disable
and
read-in disable
Read-in disable
DW 7
DW 8
DW 9
1
1
&
NC start
General feed disable
interface
Read-in disable
interface
NC start
interface
Interrogate
messages
Buffer
memory
operational
messages
Buffer
memory
error
messages
Bytes for
error mes-
sages
PLC MD
Bytes for
operational
messages
The bit fields of inactive channels can also be used to initiate error or operational messages.
The channels that are to be used additionally must be defined by the user by means of the
PLC MD 6030 ... 6031
.
19–4
©
Siemens AG 1991 All Rights Reserved 6ZB5 410-0HE02
SINUMERIK 880 (PJ)