Watlow PM PLUS™ 6
• 102 •
Chapter 8: Features
1. Be sure to make note of this number and save it somewhere outside the device for future use.
Accessing the Device with Passwords Enabled
1. Go to
Operations — Factory
and select
Unlock
.
2. Use the slider to enter the User or Admin password.
3. Press the
Home
icon to exit the Unlock parameter.
Accessing the Device with Rolling Passwords Enabled
1. Go to
Operations — Factory
—
Unlock
.
2. Scroll to select
Public Key
and make note of the number displayed: _________
3. Plug that key and your User or Admin password into the appropriate formula to find the actual current
passcode:
• Rolling Password Formula for user passwords: (Password x Public Key) Mod 929 + 70 = _________
• Rolling Password Formula for admin passwords: (Password x Public Key) Mod 997 + 1000 = _________.
4. Press the Left Back Arrow to return to the
Factory - Unlock
List, and select
Password
.
5. Use the numeric slider to set the passcode just found.
6. Press the
Home
icon to exfit.
Modbus
®
- Using Programmable Memory Blocks
When using the Modbus
®
RTU or Modbus
®
TCP protocols, the PM control features a block of addresses
that can be configured by the user to provide direct access to a list of 40 user configured parameters. This
allows the user easy access to this customized list by reading from or writing to a contiguous block of
registers.
See Appendix: Modbus Programmable Memory Blocks
When the Modbus
®
address of a target parameter is stored in an "Assembly Definition Address" its corre-
sponding working address returns that parameter’s value. If it’s a writable parameter, writing to its working
register will change the parameter value.
As an example, Modbus
®
register 360 represents the Analog Input 1 Process Value (See
Operations —
Analog Input
). If the value 360 is loaded into Assembly Definition Address 90 and value 361 is loaded into
Assembly Definition Address 91, the process value sensed by analog input 1 will also be stored in Modbus
®
registers 250 and 251. Notice that by default this parameter is also stored in working registers 240 and 241
as well.
When modifying the Modbus
®
Assembly registers, single register writes (function 06) are not al-
lowed. Multiple register writes (function 16) must be used to modify the assembly.
The "Assembly Definition Addresses and Assembly Working Addresses" table reflects the assemblies and
their associated addresses.
