Modbus - using programmable memory blocks – Watlow EZ-ZONE RM Limit Module Rev C User Manual
Page 87
Watlow EZ-ZONE
®
RML Module
•
84
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Chapter 6 Features
Note:
If Password Security (Password Enabled [pas;e]
is On) is enabled the two prompts mentioned below
in the first step will not be visible. If unknown,
call the individual or company that originally set-
up the control.
1. Acquire either the User Password [pas;u] or the
Administrator Password [pas;a].
2. Push the Advance
‰
key one time where the Code
[Code] prompt will be visible.
Note:
a. If the the Rolling Password is off push the Ad-
vance key one more time where the Password
[pass] prompt will be displayed. Proceed to
either step 7a or 8a. Pushing the Up ¿ or Down
¯ arrow keys enter either the User or Adminis-
trator Password. Once entered, push and hold
the Infinity ˆ key for two seconds to return to
the Home Page.
b. If the Rolling Password [roll] was turned on
proceed on through steps 3 - 9.
3. Assuming the Code [Code] prompt (Public Key)
is still visible on the face of the control simply
push the Advance key
‰
to proceed to the
Password
[ pass]
prompt. If not find your way
back to the Factory Page as described above.
4. Execute the calculation defined below (7b or 8b)
for either the User or Administrator.
5. Enter the result of the calculation in the upper
display play by using the Up ¿ and Down ¯ arrow
keys or use EZ-ZONE Confgurator Software.
6. Exit the Factory Page by pushing and holding the
Infinity
ˆ
key for two seconds.
Formulas used by the User and the Administrator to
calculate the Password follows:
Passwords equal:
7. User
a. If Rolling Password [roll] is Off, Password
[pass] equals User Password [pas;u].
b. If Rolling Password [roll] is On, Password
[pass] equals:
([pas;u] x code) Mod 929 + 70
8. Administrator
a. If Rolling Password [roll] is Off, Password
[pass] equals User Password [pas;a].
b. If Rolling Password [roll] is On, Password
[pass] equals:
([pas;a] x code) Mod 997 + 1000
Differences Between a User Without Password,
User With Password and Administrator
- User without a password is restricted by the
Locked Access Level [loC;l].
- A User with a password is restricted by the
Read Lockout Security [rloC] never having ac-
cess to the Lock Menu [`loC].
- An Administrator is restricted according to the
Read Lockout Security [rloC] however, the Ad-
ministrator has access to the Lock Menu where
the Read Lockout can be changed.
Modbus - Using Programmable Memory
Blocks
When using the Modbus protocol, the RML features
a block of addresses that can be configured by the
user to provide direct access to a list of 80 user con-
figured parameters. This allows the user easy access
to this customized list by reading from or writing to
a contiguous block of registers.
To acquire a better understanding of the tables
found in the back of this guide (See Appendix:
(
bus Programmable Memory Blocks
) please read
through the text below which defines the column
headers used.
Assembly Pointer Addresses
- Fixed addresses used to define the parameter
that will be stored in the "Working Addresses",
which may also be referred to as a pointer. The
value stored in these addresses will reflect (point
to) the Modbus address of a parameter within the
controller.
Assembly Working Addresses
- Fixed addresses directly related to their associ-
ated "Assembly Definition Addresses" (e.g., As-
sembly Working Addresses 200 & 201 will as-
sume the parameter pointed to by Assembly Defi-
nition Addresses 40 & 41).
When the Modbus address of a target parameter is
stored in an "Pointer Register" its corresponding
working address will return that parameter’s ac-
tual value. If it’s a writable parameter, writing to its
working register will change the parameter’s actual
value.
As an example, Modbus register 410 contains the
Analog Input 1 Process Value (See Operations Page,
Analog Input Menu). If the value 410 and 411 is load-
ed into Assembly Pointer Addresses 90 and 91, the
process value sensed by analog input 1 will also be
stored in Modbus registers 250 and 251. Note that by
default all registers are set to the Hardware ID.
The table (See Appendix:
) identified as "Assembly Definition
Addresses and Assembly Working Addresses" reflects
the assemblies and their associated addresses.