Athena 16C series User manual

SERIES
16C
TEMPERATURE/PROCESS
CONTROLLER
Standard Options and
Digital Communications
User’s Guide

©Copyright2004,AthenaControls,Inc.

Table of
Contents
For information and
instructions related to
basic operations, refer
to the Series C
operator’s manual
supplied with your
controller.
Options Wiring Diagrams
Dual Alarm Outputs (Options #10 and #22) 1
Dual Open Collector Alarms (Option #20) 2
Dual 24 Volt DC Alarm Outputs (Option #21) 3
Relay, N.O. Alarm Output (Option #23) 4
RS-232 Communications (Option #30) 5
RS-485 Communications (Option #31) 6
Contact/Digital Input with Alarm
(Options #40, #41, #42) 7
Transducer Excitation (Options #50, #51,
#52, #53) 8
Auxiliary Output (Options #60, #61, #62, #63) 9
Remote Analog Setpoint (Options #80, #81,
#82, #83, #84) 10
Guide to Digital Communications
Remote Communications Options 12
Athena+ Protocol 14
- Message Format 15
- Sample Commands 19
- Request Messages 21
- Response Messages 24
- Communications Parameter List 27
-AuxiliaryCommands 31
- Communications Error Codes 34

1
Dual Alarm
Outputs
Option #10: Dual Alarm Output, N.O.
Option #22: Dual Alarm Output, N.C.
This optional hardware module provides two alarm drive outputs. LED indicators A1 and A2
are used to indicate alarm conditions as configured in the Alarm Menu.
OptionDescription:
Option 10: Dual alarm, N.O.
Option 22: Dual alarm, N.C. (Note: NC only when power
is applied to unit; otherwise NO)
Load Limits: Max. Load Current 1 A rms
Min. Load Current 0.5 mA rms
Power Factor Range 0.2 to 1.0 (can drive small
motors, solenoids, valves, and
contactors)
Max. Surge Current
Non-repeating for 1 second 7.5A
Max. I2T for fusing (0.01 sec) 4.5 amp-squared seconds (1 A -
ABC1 typical fuse)

2
Option #20: Dual Open Collectors, NPN, Isolated
with Clamping Diode
Dual Open
Collector Alarms
Option Description: Dual open collectors, NPN, isolated, with clamping
diode
Recommended operating conditions:
Supply Voltage Pins 13 & 14; 200 working Vdc max. (Never exceed
300 Vdc)
Collector Current 50mAmax.
Specifications:
Saturation Voltage 0.3 Vdc min.
1.2 V max.
Collector-Emitter
Breakdown 300 V min.
Isolation Isolation 300 volts ac/dc output-to-output or output-
to-controller

3
Dual 24 Vdc
Alarm Outputs
Option #21: Dual 24 Vdc Alarm Outputs
Option Description: Dual 24 V outputs with clamping diodes
Pins 13 & 7 are connected internally
Source current is limited to 25 mA (1000 ohm
resistor)
Open circuit voltage is 25 volts
Isolation: Isolation 300 volts ac/dc either output to
instrument

4
Tungsten Lamp, 360 W 120 Vac
Option Description: NO (Normally open) relay contact is closed when
either alarm is active. Jumpers on the board can be
removed to activate the output for a single alarm only:
JP1-AlarmA1
JP2- AlarmA2
The relay life is greater than 100,000 operations at 5 operations per second switch-
ingfullload.
*Connect load and supply voltage per the following table:
Relay, N.O.
Alarm Output
Option #23: Relay, N.O. Alarm Output
Load Type 5 Amp Voltage Limit
Resistive DC 30 Vdc
Inductive DC (L/R = 7 ms) 20 Vdc
Resistive AC 250 Vac
Inductive AC (pF = 0.4) 150 Vac
Motor, AC, 1/6 hp 250 Vac
*
*

5
RS-232
Communications
Option #30: RS-232 (one-to-one) Communications
Option Description: Provides a one-to-one connection between
the controller and an RS-232 port.
Computers, PLCs, or dumb terminals may
be used to set and access controller data.

6
RS-485
Communications
Option #31: RS-485 (one-to-many)
Communications
Option Description: Providesone-to-manycommunications.
If run exceeds 1000 ft., terminate the controller furthest from the computer by connect-
ing a 120-ohm, 1/4-watt resistor between terminals 13 and 14.
*Converter is supplied with a wallplug-mount power transformer.

7
Contact/Digital
Input with Alarm
Option Description: Dual function board (functions unrelated)
a. Output alarm is energized when either A1
orA2 isactive.
b. Digital input controls Remote Standby, Ramp-Soak
Run/Hold, OR Second Setpoint Select.
Option 40: Active when switch closed.
Option 41: Active when switch open.
Option 42: Active when 5 V input present
LoadLimits:
Max. Load Current: 1Arms
Min. Load Current: 0.5 mA rms
Power Factor Range: 0.2 to 1.0 (can drive small motors, solenoids, valves,
and contactors)
Max. Surge Current,
Non-Repeating for
1second: 7.5A
Max. I2T for fusing (0.01 sec): 4.5 amp-squared secs (1A - ABC1
typical fuse)
Contact/Digital
Input with Alarm
Options #40, #41, #42: Contact/Digital Input with
Alarm
Input Option Menu

8
Transducer
Excitation
Option #50, #51, #52, #53: Transducer Excitation
Option Description: The transducer excitation option provides power to
remote transducers. The transducer outputs, in turn, pro-
vide a signal to the controller input which can be scaled
in the appropriate engineering units.
Option 50: 10 Vdc
Option 51: 12 Vdc
Option 52: 15 Vdc
Option 53: 5 Vdc
All options will provide at least 20 mA. The transducer circuitry is thermally protected
from short circuits.

9
Auxiliary Output
Option #60, #61, #62, #63: Auxiliary Output
Auxiliary Output
Input Option Menu
Option #60, #61, #62, #63: Auxiliary Output
OptionDescription: The Setpoint Variable or Process Variable is
transmitted to a remote device (chart recorders, indica-
tors, data recorders, computers, process
controllers, etc.) with 1 of 4 different interfaces:
Option 60: 4-20 mA
Option 61: 1-5 V
Option 62: 0-20 mA
Option 63: 0-5 V
The output signal is scalable in the Auxiliary Output Menu. Multiple remote indicators
may be driven by the controller. However, current and voltage outputs cannot be used
simultaneously.
For current (mA) options, the remote indicators are connected in series. The sum of
the input resistance for all remote indicators must be less than 400 ohms. For voltage
options, the remote indicators are connected in parallel.
The sum of the currents for all remote indicators must be less than 10 mA.

10
Remote Analog
Setpoint
Option #80, #81, #82, #83, #84: Remote Analog
Setpoint
Option Description: Remote setpoints use either voltage or current inputs,
depending on the specified option:
Option 80: 0-5 V
Option 81: 1-5 V
Option 82: 0-20 mA
Option 83: 4-20 mA
Option 84: 0-10 V
The input signal is scalable in the Remote Analog Setpoint Menu. Activation of the
analog setpoint causes the F1 indicator to illuminate. For current (mA) options, the
input resistance is 255 ohms. For voltage input options, the input resistance is greater
than 10K ohms.
*Ground shield at one end, taking care not to run wires next to power circuitry.
Maximum length will be determined by noise performance.

11
Series
16C
with
Digital
Communications
Option

12
Digital
Communications
Option
Remote Communications Options
RS-232
This method allows bidirectional data transfer via a three-
conductor cable consisting of signal ground, receive input and
transmit output. It is recommended for communication distances
less than 50 feet between the computer terminal and the instru-
ment. Note: Multiple instruments cannot be connected to the same
port.
The RS232 port is optically isolated to eliminate ground
loop problems. Typically, “Data Out” of the computer/
terminal connects to the “RCV” terminal. “Data In” connects to the
“XMT” terminal. If shielded cable is used, it should be connected to
the frame ground at one end only. Signal ground is to be connected
at appropriate ground terminals (refer to wiring diagram on next
page).
RS-422
This method allows bidirectional data transfer via a four-
wire conductor cable for distances over 50 feet between
the computer terminal and the instrument. A signal ground
wire is not required.
RS-485
The RS485 multipoint capability allows up to 32 controllers to be
connected together in a half-duplex network or up to 100 con-
trollers with an appropriate communications repeater.
Three remote commu-
nications options are
available for the 16C
which allow interfacing
to remote devices
utilizing the most
common industry
standards: RS232,
RS422, and RS485.

13
Digital
Communications
Option
This method allows bidirectional data transfer over a twisted pair cable. The twisted
pair cable is a transmission line; therefore, terminating resistors are required at the
most distant ends of the line to minimize reflections (typically 120 ohms at each end).
The RS485 circuit is fully optically isolated, eliminating ground loop problems. Parallel
drops from the transmission lines should be kept as short as possible; however, the
line may be daisy-chained at each controller. The polarity of the line is important and
each device will specify an “A” (+) and “B” (-) connection.
Figure 1a. Wiring diagram for
RS-232 digital communications.
Figure 1b. Wiring diagram for
RS-485digitalcommunications.
Note: Call factory for a
recommended RS485
converter.

14
Athena+ Protocol (Standard)
Communications
Option Menu
Athena+ Protocol
The Athena+ Protocol provides an easy way to query and
modify controller parameters using a personal computer and the
optional digital communications option of the 16C.
In this manual, the word “host” refers to the personal computer
that’s communicating with the controllers in the serial link, and the
word “slave” refers tothe controllers themselves.
All transactions between the host and the slaves are done with
messages consisting of only printable ASCII characters. There are
only two primary types of messages: Requests
and Responses. Messages coming from the host are called
requests and messages coming from the slaves are called
responses.
With the exception of a broadcast request, for every request sent
from the host, the slave will send back a response. If a slave does
not respond within 100 milliseconds, then the request can be con-
sidered lost.
A broadcast request is a request having an ID of ‘00’ (see Message
Formats on next page). It is used to address all slaves on the net-
work. All slaves on the network will perform the actions requested
in a broadcast message. However, a response message will not be
returned. Therefore, the host can only broadcast Write or Auxiliary
Command Requests. All slaves will ignore all Read Broadcast
Requests.
Digital
Communications
Option

15
Message Formats
All Athena+ messages adhere to the general format of:
[START CHAR][ID][ZONE][TYPE][PARAM][ERROR]
[DATA][CHKSUM][END CHAR]
START CHAR
This is a single character which designates the start of the mes-
sage. For a Request message, this character is the ASCII‘$’ and
for a Response message, this character is the ASCII ‘%’.
ID
This is a two-character ID identifying the receiving controller.
Controller IDs go from 1-255 inclusively and all slaves in the net-
work must have unique IDs. The ID number of ‘00’, when used in a
request, designates a broadcast message that is used to address
all controllers in the network. See the section Request Message for
an explanation of the broadcast message.
In order to represent 255 with just two ASCII characters, a number
system known as the Message Code Numbering System is used.
In this system, the most significant digit is represented with the
numbers 0-9 and the letters A-Z and the least significant digit is
represented with the numbers 0-9. The numbers 0-9 have the
Digital
Communications
Option

16
same values as their decimal
counterparts and the letters A-Z have the values of 100 - 350 inclu-
sively in increments of 10.
Example:
Message Code Value =Decimal Value
00 0 + 0 = 00
99 90 + 9 = 99
A0 100 + 0 = 100
A2 100 + 2 = 102
B8 110 + 8 = 118
P5 250 + 5 = 255
Zone
This is a two character ID identifying the Zone number in multi-
zone capable controllers. For the 16C, this number must be 01.
Digital
Communications
Option

17
Type
This is a single character identifying the type of message. The fol-
lowing table lists the type characters for all messages.
TYPE character Message Type
RRead Request or Read
Response Returning a
Positive Result
rRead Response Returning a
Negative Result
WWrite Positive Value Request
and Response
wWrite Negative Value Request
and Response
AAuxiliary Command
For further information, see following sections on the
different message types.
Digital
Communications
Option