Transmission Contents And Word Allocations; Reading Process Values - Omron E5ZE-8 Communications Manual

Transmission Contents and Word Allocations

3-1 Transmission Contents and Word Allocations
3-2

Reading Process Values

Example
10
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.
Inputs
First word Control point 0 process value
+ 1 Control point 1 process value
+ 2 Control point 2 process value
+ 3 Control point 3 process value
+ 4 Control point 4 process value
+ 5 Control point 5 process value
+ 6 Control point 6 process value
+ 7 Control point 7 process value
+ 8 Alarm 1 status
+ 9 Alarm 2 status
+ 10 Auto-tuning status
+ 11 HB (heater burnout) alarm sta-
tus
+ 12 HS (SSR failure) alarm status
+ 13 Operating status
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.
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.
Leftmost bit
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
1111110001111100
If the value in the word is 0000010001001100, the values are as follows:
Binary
0000010001001100
First word
+ 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
---
Rightmost bit
Hexadecimal Decimal
FC7C -900
Hexadecimal Decimal
044C 1100
Section 3-1
Outputs
Control point 0 set point
Control point 1 set point
Control point 2 set point
Control point 3 set point
Control point 4 set point
Control point 5 set point
Control point 6 set point
Control point 7 set point
Start/stop temperature
control
Process value
-90.0 C
Process value
110.0 C