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420
Do not leave Service Disable Bits ON for longer than is necessary; service be-
tween the PC and the designated Unit will be stopped completely as long as the
corresponding Service Disable Bit is ON.
Word(s)
Bit(s)
Function
A015
00 to 15
CPU Bus Service Disable Bits
(Bits 00 to 15 correspond to units #0 to #15.)
A017
03
Host Link/NT Link Service Disable Bit
04
Programming Device Service Disable Bit
05
I/O Refresh Disable Bit
6-2-2 Duplex Initialization
When the PC is operating in duplex mode, duplex initialization is performed just
after host link servicing to coordinate data values in the active and standby CPU
Units. An active/standby CPU changeover cannot occur during duplex initializa-
tion because the PC is in simplex status, not duplex status, during duplex initiali-
zation.
PC operation will not continue if a changeover error (WDT error, memory error,
or CPU Usage Switch setting of “NO USE”) occurs in the active CPU Unit during
duplex initialization.
The following table shows the execution timing and processing that occur during
duplex initialization. (UM is the Program Area and IOM is I/O memory.)
Execution Timing
Processing
g
UM
Verification
UM
Transfer
PC Setup
Verification
PC Setup
Transfer
EM Size
Verification
EM
Transfer
IOM
Transfer
Both CPUs are turned ON with
DPL setting.
YES
---
YES
---
YES
YES
YES
Initialize Button is pressed with
DPL setting. (Unless the PC is
already operating in duplex
mode.)
YES
YES
YES
YES
YES
YES
YES
Start of operation in duplex mode
---
---
---
---
YES
YES
YES
s
0202: MEMORY AREA
WRITE
---
---
YES
YES
YES
YES
YES
s
0203: MEMORY AREA FILL
---
---
YES
YES
YES
YES
YES
s
0221: UNIT SETUP WRITE
---
---
YES
YES
YES
YES
YES
s
0222: I/O TABLE CREATE
---
---
YES
YES
YES
YES
YES
s
0304: PROGRAM AREA
PROTECT
YES
YES
---
---
YES
YES
YES
a
nd
s 0305: PROGRAM AREA
PROTECT CLEAR
YES
YES
---
---
YES
YES
YES
c
omm
a
0307: PROGRAM AREA
WRITE
YES
YES
---
---
YES
YES
YES
F
INS c
o
0321: PROGRAM
INSERT/DELETE
YES
YES
---
---
YES
YES
YES
F
0323: OPERAND CHANGE
YES
YES
---
---
YES
YES
YES
0325: TIM/CNT SV CHANGE
YES
YES
---
---
YES
YES
YES
2104: ONLINE I/O REPLACE
START/END
---
---
---
---
YES
YES
YES
220B: PARAMETER AREA
FILE TRANSFER
---
---
YES
YES
YES
YES
YES
220C: PROGRAM AREA FILE
TRANSFER
YES
YES
---
---
YES
YES
YES
Cycle Time
Section 6-2
Summary of Contents for CVM1D
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