39
I/O
Data contents
Data item
Address
Bit
Word
Input
n+3
15 to 00
Loop 1 PV
Outputs the Loop 1 and Loop 2 PV (process value) as 4-digit
BCD data For platinum resistance thermometer data the least
n+4
15 to 00
Loop 2 PV
BCD data. For platinum resistance thermometer data, the least
significant digit is 0.1. The most significant digit is F for minus (–).
n+5
15 to 00
Loop 1 SP
Outputs the Loop 1 and Loop 2 SP (set point) as 4-digit BCD
data For platinum resistance thermometer data the least
n+6
15 to 00
Loop 2 SP
data. For platinum resistance thermometer data, the least
significant digit is 0.1. The most significant digit is F for minus (–).
n+7
15 to 12
Loop 1
executed
bank
number
Outputs the bank number currently executed for Loop 1 and Loop
2 as 1-digit BCD data. Executed bank numbers are from 1 to 8.
11 to 08
Loop 2
executed
bank
number
07 to 02
---
Not used. Each bit is set to 0.
01
SW2-2
Outputs the ON/OFF status of SW2-2 (setting direction).
0: Data Setting Console
1: CPU Unit
00
SW2-1
Outputs the ON/OFF status of SW2-1 (switching memory
contents).
0: Fixed
1: Normal
n+8 Loop 1
n+9 Loop 2
15
---
Not used. Set to 0.
Loop 1/2
status data
14
Sensor
error
Bit set to 1 if the sensor is not connected, a sensor
wire is broken, or the input data exceeds the
operational temperature range.
13
CT
overflow
Bit set to 1 when the detected heater current
exceeds 5.5 A.
12 to 09
---
Not used. Each bit is set to 0.
08
STOP
Bit set to 0 during temperature control and set to 1
when the control stop is executed.
07 to 05
---
Not used. Each bit is set to 0.
04
Control
output
Bit set to 1 when the control output (transistor or
voltage output) is ON. The bit is always 0 for current
output.
03
AT
Bit set to 1 during auto-tuning (AT).
02
HB
Bit set to 1 if the detected heater current drops
below the set heater burnout current value. (HB:
heater burnout)
01
AL1
Bit set to 1 when the temperature enters the set
l
(R f
25)
00
AL2
alarm range (Refer to page 25).
Note If the setting direction of the Temperature Control Unit is set to the CPU Unit and
the CPU Unit is in PROGRAM mode, all word data will be 0. Therefore, if the
CPU Unit is in PROGRAM mode and has been set for continuous control, the
Temperature Control Unit will continue executing temperature control even
when the CPU Unit stops operating and will assume that the SP has been
changed to 0
°
C. To prevent this, set SW2-2 on the Temperature Control Unit to
OFF (i.e., the setting direction is set to the Data Setting Console) before the CPU
Unit stops operating and reset SW2-2 after the CPU Unit restarts.
Memory Allocation
Section 4-1
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