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7-1 SR Area Flags
PC RUN Flags can be read to determine the operational status of each PC to
which a PC Link Unit is mounted. All PCs are operational when their PC RUN
Flag is ON.
If there is a transfer error or a power failure for any PC Link Unit, the Error
Flag for that Unit will turn ON, and an error message will be sent. When the
error is removed (the power comes on or transfer preparation is completed)
the Error Flag will go OFF. An error in Unit 0 stops all data transfer, but an
error in another Unit only stops that Unit’s communication. LR bit status is
maintained whenever communication stops for one or more Units. Error
Flags will not turn ON for FALS(07) instructions; use the PC RUN Flags. The
following tables show the unit number for Single-level Systems (top line) and
the unit number followed by the level for Multilevel Systems (bottom line).
C200H, C200HS, C200HX/HG/HE(-Z), C1000H, and C2000H PCs
Bit
15
Bit 8 Bit 7 Bit 0
SR
247
#31
#15,1
#30
#14,1
#29
#13,1
#28
#12,1
#27
#11,1
#26
#10,1
#25
#9,1
#24
#8,1
#31
#15,1
#30
#14,1
#29
#13,1
#28
#12,1
#27
#11,1
#26
#10,1
#25
#9,1
#24
#8,1
SR
248
#23
#7,1
#22
#6,1
#21
#5,1
#20
#4,1
#19
#3,1
#18
#2,1
#17
#1,1
#16
#0,1
#23
#7,1
#22
#6,1
#21
#5,1
#20
#4,1
#19
#3,1
#18
#2,1
#17
#1,1
#16
#0,1
SR
249
#15
#15,0
#14
#14,0
#13
#13,0
#12
#12,0
#11
#11,0
#10
#10,0
#9
#9,0
#8
#8,0
#15
#15,0
#14
#14,0
#13
#13,0
#12
#12,0
#11
#11,0
#10
#10,0
#9
#9,0
#8
#8,0
SR
250
#7
#7,0
#6
#6,0
#5
#5,0
#4
#4,0
#3
#3,0
#2
#2,0
#1
#1,0
#0
#0,0
#7
#7,0
#6
#6,0
#5
#5,0
#4
#4,0
#3
#3,0
#2
#2,0
#1
#1,0
#0
#0,0
Error Flags PC RUN Flags
C500 PCs
Bit
15
Bit 8 Bit 7 Bit 0
SR
58
#7,1 #6,1 #5,1 #4,1 #3,1 #2,1 #1,1 #0,1 #7,1 #6,1 #5,1 #4,1 #3,1 #2,1 #1,1 #0,1
SR
62
#7
#7,0
#6
#6,0
#5
#5,0
#4
#4,0
#3
#3,0
#2
#2,0
#1
#1,0
#0
#0,0
#7
#7,0
#6
#6,0
#5
#5,0
#4
#4,0
#3
#3,0
#2
#2,0
#1
#1,0
#0
#0,0
Error Flags PC RUN Flags
AR area flags that indicate the type of System and level of the Subsystem of
the PC Link Unit mounted to the PC are also provided for C200H, C200HS,
C200HX/HG/HE(-Z), C1000H, and C2000H PCs. AR bit 2411 will be ON if a
level 1 PC Link Unit in a Multilevel System is mounted to the PC.
AR bit 2412 will be ON if a level 0 PC Link Unit in a Multilevel System or a
PC Link Unit in a Single-level System is mounted to the PC.
PC RUN and Error Flags
Level Flags
SR Area Flags Section 7-1