6 Programless Communications
6 - 20
E5
C-T Digital Temperature Controllers Programmable Type Communications Manual (H186)
6-3
Controlling Programless
Communications
The section describes the methods that are used to control programless communications from the PLC.
There are the following three ways to control programless communications. The Request Flag in PLC
memory is used to change the control method.
1. Updating Monitor Values (Disable Writing Request)
If you set the Request Flag to 0, the Response Flag will change to 0 and the monitor values will be updated.
2. Writing Set Values and Updating Monitor Values (Enable Writing Request)
If you set the Request Flag to 1, the set values will be written to the E5
@
C-T and then the operation
command will be written to the E5
@
C-T. Finally the Response Flag will change to 1 and the monitor val-
ues will be updated. The operation command is processed only the first time, but the set values are
written each time. Therefore, you cannot change the parameters that are specified for download set-
tings at the E5
@
C-T. To change parameters that are specified for download settings at the E5
@
C-T,
refer to
3. Initializing the Download Area
If you set the Request Flag to 2, the set values in the download area will be initialized to the values from
the E5
@
C-T and then the Request Flag and Response Flag will change to 1. Finally, the operation
described above for control method 2 is performed.
6-3-1
Controlling Programless Communications with the Request Flag
25
0
C
PLC memory
Upload
Area
Response Flag
Comm
u
nications Stat
u
s
Monitor
V
al
u
e
Re
qu
est Flag: 0
Operation Command Code
Set
V
al
u
e
Do
w
nload
Area
Response Flag: 0
Comm
u
nications Stat
u
s
Monitor
V
al
u
e
Re
qu
est Flag: 0
Operation Command Code
Set
V
al
u
e
The monitor
v
al
u
es are
repeatedly
u
pdated.
PLC memory
25
0
C
PLC memory
PLC memory
Response Flag
Comm
u
nications Stat
u
s
Monitor
V
al
u
e
Re
qu
est Flag: 1
Operation Command Code
Set
V
al
u
e
Response Flag: 1
Comm
u
nications Stat
u
s
Monitor
V
al
u
e
Re
qu
est Flag: 1
Operation Command Code
Set
V
al
u
e
b
. Monitor
v
al
u
es are
u
pdated
and then “a” is performed.
a. Set
v
al
u
e
w
ritten to
E5
@
C-T.
25
0
C
PLC memory
PLC memory
Response Flag
Comm
u
nications Stat
u
s
Monitor
V
al
u
e
Re
qu
est Flag: 2
Operation Command Code
Set
V
al
u
e
Response Flag: 1
Comm
u
nications Stat
u
s
Monitor
V
al
u
e
Re
qu
est Flag: 1
Operation Command Code
Set
V
al
u
e
The set
v
al
u
es are initialized to the
v
al
u
es in
the E5
@
C-T and
w
riting is ena
b
led.
Summary of Contents for E5CC-T
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Page 184: ...Index 4 E5 C T Digital Temperature Controllers Programmable Type Communications Manual H186...
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