RKC INSTRUMENT FB400 Communication Quick Manual

Digital Controller
Communication
FB400/FB900
Quick Manual
All Rights Reserved, Copyright  2004, RKC INSTRUMENT INC.
This manual describes the connection method with host computer, communication
parameters and communication data (except for parameters in Engineering Mode) of
the FB400/FB900. For detailed host communication such as communication data in
the Engineering mode, protocol and Modbus data mapping description, refer to the
FB100/FB400/FB900 Communication Instruction Manual (IMR01W04-E).
The Communication Instruction Manual can be downloaded from the official
RKC website: http://www.rkcinst.com/english/manual_load.htm.
1. OUTLINE
Digital Controller FB400/FB900 (hereafter, called controller) interfaces with the host
computer via RKC or Modbus communication protocols. In addition, there is the
Modbus data mapping function which enables high-speed communication by
collecting only the data to be communicated at all times in the specified address area.
 Communication port
There are two communication ports: Communication 1 and Communication 2.
Communication 1 is used for host communication.
Communication 2 is used for intercontroller communication, but can be also used for
host communication.
When Communication 2 is used for host communication, refer to the FB100/
FB400/FB900 Communication Instruction Manual (IMR01W04-E).
 Communication interface
Communication 1 interface: RS-422A, RS-485, RS-232C
Communication 2 interface: RS-485
(When Communication 1 is used for RS-422A, no
Communication 2 can be used.)
2. WIRING
!
WARNING
To prevent electric shock or instrument failure, turn off the power
before connecting or disconnecting the instrument and peripheral
equipment.
Make sure that lugs or unshielded cables of the communication
terminals are not touched to the screw heads, lugs, or unshielded cables
of the power supply terminals to prevent electric shock or instrument
failure. Use additional care when two lugs are screwed to one
communication terminal.
The cable and termination resistor(s) must be provided by the customer.
2.1 RS-485
 Communication terminal number and signal details
Terminal No. Signal name Symbol
25 Signal ground SG
26 Send data/Receive data T/R (A)
27 Send data/Receive data T/R (B)

Wiring method
 When the interface of host computer (Master) is RS-485
Paired wire
Controller (Slave) Host computer (Master)
RS-485
SG 25 SG
()
T/R (A) 26 T/R (A)
T/R (B) T/R (B)
27
()
*R
Shielded twisted
pair wire
Communication terminals
(communication 1 side)

Screw size: M3×7 (with 5.8×5.8 square washer)

 Recommended tightening torque:
Controller (Slave)
0.4 N･m (4 kgf･cm)
Specified solderless terminals:
SG 25
Manufactured by J.S.T MFG CO., LTD.
()
Circular terminal with isolation V1.25-MS3
T/R (A) 26
(M3 screw, width 5.5 mm, hole diameter 3.2 mm)
T/R (B) 27
() *R: Termination resistors (Example: 120  1/2 W)
*R
If communication errors occur frequently due to
the operation environment or the communication distance,
connect termination resistors.
Communication terminals
Maximum connections: Up to 31 controllers
(communication 1 side)
 When the host computer (Master) has a USB connector
Connect the USB communication converter between the host computer and the controller.
IMR01W07-E4
Paired wire
RS-485
Controller (Slave)
SG
25
()
T/R (A) 26
T/R (B) 27
()
Shielded twisted
pair wire
Communication terminals
(Communication 1 side)



Screw size: M3×7 (with 5.8×5.8 square washer)
Controller (Slave)
Recommended tightening torque:
0.4 N･m (4 kgf･cm)
SG
25
Specified solderless terminals:
()
Manufactured by J.S.T MFG CO., LTD.
T/R (A) 26
Circular terminal with isolation V1.25-MS3
T/R (B) (M3 screw, width 5.5 mm, hole diameter 3.2 mm)
27
()
*R
*R: Termination resistors (Example: 120  1/2 W)
If communication errors occur frequently due to
the operation environment or the communication distance,
connect termination resistors.
Communication terminals
Maximum connections: Up to 31 instruments
(Communication 1 side)
For the COM-K, refer to the COM-K Instruction Manual (IMR01Z01-E).
2.2 RS-422A
 Communication terminal number and signal details
Terminal No. Signal name Symbol Terminal No.
25 Signal ground SG
26 Send data T (A)
27 Send data T (B)

Wiring method
Paired wire
RS-422A
Controller (Slave)
SG 25
()
T (A) 26
T (B) 27
()
()
R (A) 28
R (B) 29
()
Communication terminals
(communication 1 side)
Shielded twisted

pair wire


Screw size: M3×7 (with 5.8×5.8 square washer)
Controller (Slave)
Recommended tightening torque:
SG 25 0.4 N･m (4 kgf･cm)
()
*R Specified solderless terminals:
T (A)
26
Manufactured by J.S.T MFG CO., LTD.
T (B) 27 Circular terminal with isolation V1.25-MS3
()
(M3 screw, width 5.5 mm, hole diameter 3.2 mm)
()
R (A) 28
*R: Termination resistors (Example: 120  1/2 W)
If communication errors occur frequently due to
R (B) 29
()
*R the operation environment or the communication distance,
connect termination resistors.
Communication terminals
(communication 1 side)
Maximum connections: Up to 31 controllers
Using a USB communication converter COM-K (RKC product) enables
connection with the USB port of the host computer.
2.3 RS-232C
 Communication terminal number and signal details
Terminal No. Signal name Symbol
25 Signal ground SG (GND)
26 Send data SD (TXD)
27 Receive data RD (RXD)
()

Wiring method
()
RS-232C
Controller (Slave)
SG (GND) 25
SD (TXD) 26
RD (RXD) 27
Shielded wire
Communication terminals
(communication 1 side)
Number of connection: 1 controller
Screw size: M3×7 (with 5.8×5.8 square washer)
Recommended tightening torque:
0.4 N･m (4 kgf･cm)
Specified solderless terminals:
Manufactured by J.S.T MFG CO., LTD.
Circular terminal with isolation V1.25-MS3
(M3 screw, width 5.5 mm, hole diameter 3.2 mm)
2.4 Connections for Loader Communication
Controller is equipped standard with a loader communication connector.
The controller loader communication connector, our COM-K USB communication converter
Host computer (Master)
(sold separately), and a host computer can be connected with the appropriate cables.
Connect to
USB port
FB400
bottom view
USB communication
converter COM-K
USB cable
(RKC product)
(COM-K accessory)
SG
1
T/R (A)
2
Connect to
USB connector
Loader communication
3 T/R (B)
of COM-K
cable (W-BV-01)
[Optional]
4 Unused
The termination
resistor is built
5 Unused into the COM-K.
Connect to loader
USB communication converter
communication
COM-K (RKC product)
connector of
FB400
The Loader port is only for parameter setup.
Loader communication corresponds to RKC communication (based on
ANSI X3.28-1976 subcategories 2.5 and A4).
For the COM-K, refer to the COM-K Instruction Manual (IMR01Z01-E).
3. SETTING
To establish communication parameters between host computer (master) and
controller (slave), it is necessary to set the device address (slave address),
communication speed, data bit configuration and interval time on each controller
(slave) in the Setup setting mode.
Signal name Symbol
After all communication parameters are set, in order to make these
28 Receive data R (A)
values thus set valid perform any of the following operations.
29 Receive data R (B)
 The power is turned on again after turning it off once.
 The RUN/STOP mode is changed in RUN from STOP again after
changing it in STOP once.
Parameters which are not related to existing functions on the controller are
Host computer (Master)
not displayed.
SG
This instrument returns to the PV/SV monitor screen if no key operation is
()
*R
T (A) performed for more than one minute.
T (B)
()
This section describes the
()
R (A)
communication. For the screen operation and key operation, refer to the
R (B) FB400/FB900 Quick Operation Manual (IMR01W02-E).
()
*R

Description of each parameters
Symbol Name
Device address 1 0 to 99
(Slave address 1)
(Add1)
Communication 2.4:
speed 1 4.8:
9.6:
(bPS1)
19.2: 19200 bps
38.4: 38400 bps
Data bit Refer to data bit
configuration 1 configuration table
(bIT1)
Interval time 1 * 0 to 250 ms
(InT1)
Host computer (Master)
* The interval time for the controller should be set to provide a time for host computer
to finish sending all data including stop bit and to switch the line to receive status for
SG (GND)
the host. If the interval time between the two is too short, the controller may send
SD (TXD) data before the host computer is ready to receive it. In this case, communication
transmission cannot be conducted correctly.
RD (RXD)
Data bit configuration table
*
RS (RTS)
Set
Data bit Parity bit
value
CS (CTS)
8n1 8 Without
8n2 8 Without
*
Short RS and CS within connector.
8E1 8 Even
8E2 8 Even
8o1 8 Odd
8o2 8 Odd
a
When the Modbus communication protocol selected, this setting becomes invalid.
4. COMMUNICATION DATA LIST
 Modbus register address
 Attribute (A method of how communication data items are read or written
Host
computer
Connect
to USB
connector
USB cable
(COM-K accessory)
 Data
Connect to USB port
RKC communication
The termination
of host computer
resistor is built
into the COM-K.
Communication settings on the computer
(the following settings are all fixed)
Communication speed: 38400 bps
Address: 0
Most significant
Connect to loader
Start bit: 1
communication digit
Data bit: 8
connector
Parity bit: Without
Stop bit: 1

Communication data (RKC communication/Modbus)
No. Name
1 Model codes
2 Measured value
1
(PV)
3 Current transformer 1
(CT1) input value
monitor
4 Current transformer 2
(CT2) input value
monitor
5 Set value (SV)
monitor
Remote setting
6
(RS) input value
monitor
7 Burnout state monitor
8 Burnout state monitor
of feedback
resistance input
9 Event 1 state monitor
parameters which must be set for host
10 Event 2 state monitor
11 Event 3 state monitor
12 Event 4 state monitor
Factory
Data Setting Description
set value
13 Heater break alarm 1
Do not use the same device 0
(HBA1) state monitor
address for more than one
controller in multi-drop
14 Heater break alarm 2
connection. Each controller must
(HBA2) state monitor
have a unique address in
15 Manipulated output
multi-drop connection.
value (MV1) monitor
In Modbus communication,
[heat-side]
communication is not possible
when the address is 0.
2400 bps Set the same communication 19.2
4800 bps speed for both the controller
9600 bps (slave) and the host computer
(master).
16 Manipulated output
value (MV2) monitor
Set the same data bit 8n1
[cool-side]
configuration for both the
17 Error code
controller (slave) and the host
computer (master).
The interval time for the controller 10
should be set to provide a time
for host computer to finish
sending all data including stop
bit and to switch the line to
receive status for the host.
Set
Stop bit Data bit Parity bit Stop bit
value
a
1 7n1 7 Without 1
a
2 7n2 7 Without 2
a
1 7E1 7 Even 1
a
2 7E2 7 Even 2
a
1 7o1 7 Odd 1
a
2 7o2 7 Odd 2
1
Varies with the setting of the Decimal point position selection.
HEX: Hexadecimal DEC: Decimal
when viewed from the host computer is described)
(Host computer  Controller)
RO: Read only data
R/W: Read and Write data (Host computer  Controller)
Modbus
ASCII code data of 7 digits 16-bit data
............ ........................................
Least significant Bit 15 Bit 0
....
digit
Modbus
RKC
register Attri- Factory
Iden- Data range
address bute set value
tifier
HEX DEC
  
ID RO Model code (character)
M1 0000 0 RO Input scale low to 
Input scale high

M3 0001 1 RO CTL-6-P-N:
0.0 to 30.0A
CTL-12-S56-10L-N:
M4 0002 2 RO 0.0 to 100.0 A 

MS 0003 3 RO Setting limiter low to
1
Setting limiter high
RO Setting limiter low to 
S2 0004 4
Setting limiter high
1
B1 0005 5 RO 0: OFF 
1: ON

B2 0006 6 RO 0: OFF
1: ON
AA 0007 7 RO 0: OFF 
1: ON

AB 0008 8 RO

AC 0009 9 RO
AD 000A 10 RO 

AE 000B 11 RO 0: OFF
1: ON
AF 000C 12 RO 
O1 000D 13 RO PID control or Heat/Cool PID 
control:
5.0 to 105.0 %
Position proportioning PID
control with feedback
resistance (FBR) input:
0.0 to 100.0 %
RO 5.0 to 105.0 % 
O2 000E 14

ER 000F 15 RO RKC communication
1: Adjustment data error
2: Back-up error
4: A/D conversion error
32: Custom data error
128: Watchdog timer
256: Stack overflow
2048: Program error (busy)

Modbus (Bit data)
Bit 0: Adjustment data error
Bit 1: Back-up error
Bit 2: A/D conversion error
Bit 3 to Bit 4: Unused
Bit 5: Custom data error
Bit 6: Unused
Bit 7: Watchdog timer
Bit 8: Stack overflow
Bit 9 to Bit 10: Unused
Bit 11: Program error (busy)
Bit 12 to Bit 15: Unused
Data 0: OFF 1: ON
[Decimal number: 0 to 4095]