10
Transmission Contents and Word Allocations
Section 3-1
3-1
Transmission Contents and Word Allocations
When remote I/O communications are used with the E5ZE, reading the pro-
cess value, starting and stopping temperature control, and writing set points
are possible for any control point, without requiring a special program to be
executed from the Master Unit. Data is automatically refreshed at every 200
-
ms cycle. There are 14 input words and 9 output words allocated to the E5ZE
in the Master Unit (I/O directions are in reference to the Master Unit). Each
word is allocated according to the following table.
The first input and output words are normally determined according to the
Master Unit being used and the node address. The first I/O words can be
changed and a Configurator is used to change the Master Unit settings.
3-2
Reading Process Values
The process value for each control point is expressed as 16
-
bit signed binary
data (two
’
s complement for negative values) in the corresponding word allo-
cated in the Master Unit mounted to the PC. The unit used depends on the
position of the decimal point in the E5ZE. The default values are 1
°
C/
°
F for
thermocouples and 0.1
°
C/
°
F for platinum resistance thermometers.
Example
If the setting unit is 0.1
°
C/
°
F, and the value in the allocated word is
1111110001111100, the conversion values are as follows:
Binary
Hexadecimal
Decimal
Process value
1111110001111100
FC7C
-900
-90.0
°
C
If the value in the word is 0000010001001100, the values are as follows:
Binary
Hexadecimal
Decimal
Process value
0000010001001100
044C
1100
110.0
°
C
Inputs
Outputs
First word
Control point 0 process value
First word Control point 0 set point
+ 1
Control point 1 process value
+ 1
Control point 1 set point
+ 2
Control point 2 process value
+ 2
Control point 2 set point
+ 3
Control point 3 process value
+ 3
Control point 3 set point
+ 4
Control point 4 process value
+ 4
Control point 4 set point
+ 5
Control point 5 process value
+ 5
Control point 5 set point
+ 6
Control point 6 process value
+ 6
Control point 6 set point
+ 7
Control point 7 process value
+ 7
Control point 7 set point
+ 8
Alarm 1 status
+ 8
Start/stop temperature
control
+ 9
Alarm 2 status
---
+ 10
Auto
-
tuning status
+ 11
HB (heater burnout) alarm sta-
tus
+ 12
HS (SSR failure) alarm status
+ 13
Operating status
Leftmost bit
Rightmost bit