Watlow EZ-ZONE PM Integrated Controller - Manual (Page 52)

Watlow EZ-ZONE ® PM Integrated Controller • 49 • Chapter 4 Home Page
Data Type R/W
uint = Unsigned 16 bit
integer
dint = Signed 32-bit,
long
string = ASCII (8 bits
per character)
float = IEEE 754 32-bit
RWES = Readable
Writable
EEPROM (saved)
User Set (saved)
Display
Visual information from the control is displayed to the observer using a fairly standard 7 segment display.
Due to the use of this technology, several characters displayed need some interpretation, see the list below:
[1] = 1 [0] = 0 [i] = i [r] = r
[2] = 2 [a ] = A [j ] = J [S] = S
[3]
= 3
[ b]
= b
[H]
= K
[ t]
= t
[4]
= 4
[c]
, [C] = c
[ l]
= L
[U]
= u
[5] = 5 [d ] = d [ m ] = M [u] = v
[6] = 6 [ e] = E [n] = n [ w ] = W
[7] = 7 [ f] = F [o] = o [y ] = y
[8]
= 8
[g ]
= g
[ p]
= P
[2]
= Z
[9]
= 9
[ h]
= h
[q ]
= q
Range
Within this column notice that on occasion there will be numbers found within parenthesis. This number
represents the enumerated value for that particular selection. Range selections can be made simply by writ-
ing the enumerated value of choice using any of the available communications protocols. As an example, turn
to the Setup Page and look at the Analog Input [`Ai] menu and then the Sensor Type [Sen] prompt. To turn
the sensor off using Modbus simply write the value of 62 (off) to register 368 and send that value to the con-
trol.
Communication Protocols
When using a communications protocol in conjunction with the EZ-ZONE PM there are two possible ports
(instances) used. Port 1 or instance 1 is always dedicated to Standard Bus communications. This same in-
stance can also be used for Modbus RTU if ordered. Depending on the controller part number port 2 (in-
stance 2) can be used with Modbus, CIP and Profibus. For further information read through the remainder
of this section.
Modbus Introduction to the Modbus Protocol
Gould Modicon, now called AEG Schneider, first created the protocol referred to as "Modbus RTU" used in
process control systems. Modbus provides the advantage of being extremely reliable in exchanging informa-
tion, a highly desirable feature for industrial data communications. This protocol works on the principle of
packet exchanges. The packet contains the address of the controller to receive the information, a command
field that says what is to be done with the information, and several fields of data. Each PM parameter has
a unique Modbus address and they can be found in the following Operations, Setup, Profiling, and Factory
Pages.
Conventions Used in the Menu Pages (cont.)