P520 SIGNAL PROCESSOR
11
66-2066—01
To change or check the station number of the P520, proceed
as follows:
1.
Press and hold the Reset button for 4 seconds.
2.
The 4 LED digits will show the baud rate and the station
number. The 2 leftmost digits are the baud rate (96 or
48); the 2 rightmost digits are station number from (0 to
63).
3.
Press the up/down button to change the station number.
4.
Press the Store button to save station number.
Protocol Detect
P520 with firmware version 5.0 still supports the existing
Honeywell proprietary protocol. After power-up, the processor
will listen for both protocols. Once the protocol has been
detected, communication must remain in this protocol until the
unit is powered off.
MODBUS RTU Function Supported
Four Modbus functions are supported:
• 01 Output Coil Read
• 03 Holding Register Read
• 06 Preset Single Holding Register
• 16 Preset Multiple Holding Register
Registers Map
Communication with Modicon PLC
Each Modicon PLC comes with a Modbus port. The control
program can read/write the settings from/to the P520 signal
processor via this port. A XMIT loadable module is needed to
send Modicon functions. The XMIT loadable module is
available from Modicon Inc.
NOTE: Not all models of Modicon PLC’s will accept the
XMIT loadable module. Please consult your local
Modicon dealer for more information.
Communication with Human-
Interface Host Computer
A number of Modbus drivers for your operating system are
available from third party developers. These drivers allows
your application programs to communicate with the P520
signal processors directly.
USB to RS-422 Conversion
It is necessary to use a converter at the host computer. The
Honeywell COMMOD converter module can be used, and is
recommended because of its photocoupler isolation. The
converter must have galvanic ground isolation.
Setting Addresses
Each P520 must have its own unique address. The address
can easily be changed by pressing the RESET push-button for
>2 seconds. This causes the P520 to display its address on
the four-digit display (0000 to 0063). The address can now be
changed by using the UP or DOWN arrow buttons. When the
desired address is displayed, push the STORE button, and the
P520 will restore this new address.
In P520 signal processors with software revision 3.p and
higher, the baud rate can also be changed when the module
address is changed. The baud rate is displayed in the highest
two digits of the numeric display (i.e., 4802 is 4800 baud and
Table 6. 4x or numerical registers.
Value
Definition
400001
Flame Count Of Active Channel (read
only)
400002
Processor Status (read only)
400002/0
Viewing head/Channel Selected
(0=Channel A)
400002/1
Flame On Relay Status
400002/2
Processor Lockout Status (0=lockout)
400002/3
Panel Access Disabled (0=disabled)
400002/44-20
Output Status (0=0-20)
400003
Flame On Channel A
400004
Flame On Channel B
400005
Flame Off Channel A
400006
Flame Off Channel B
400007
Gain Channel A
400008
Gain Channel B
400009IR
Analog Gain Channel A
400010IR
Digital Gain Channel A
400011IR
Filter Channel A
400012UV
Gain Channel A
400013IR
Analog Gain Channel B
400014IR
Digital Gain Channel B
400015IR
Filter Channel B
400016UV
Gain Channel B
400017
Viewing Head Type Channel A (read
only)
400018
Viewing Head Type Channel B (read
only)
400019
Temperature Channel A (read only)
400020
Temperature Channel B (read only)
400021
Time Delay on (Upper nibble = B lower
=A)
400022FFRT
(Upper nibble = B lower = A)
400023
Firmware Version # (read only)
Table 7. 0x or discrete registers (all read only).
Value
Definition
000001
Viewing head/Channel Selected
(0=Channel A)
000002
Flame On Relay Status
000003
Processor Lockout Status (0=lockout)
000004
Panel Access Disabled (0=disabled)
0000054-20
Output Status (0=0-40)
Table 6. 4x or numerical registers.
Value
Definition
