Control Technologies 2500 Series Operating instructions

2500 Series®
CTI 2500-RBC
PROFIBUS REMOTE BASE CONTROLLER
INSTALLATION AND OPERATION GUIDE
Version 1.7
2500RBCIOG 1062016

Copyright ©2015 Control Technology Inc.
All rights reserved.
This manual is published by Control Technology Inc., 5734 Middlebrook Pike, Knoxville, TN 37921.
This manual contains references to brand and product names which are tradenames, trademarks,
and/or registered trademarks of Control Technology Inc. Siemens® and Simatic® are registered
trademarks of Siemens AG. Other references to brand and product names are tradenames,
trademarks, and/or registered trademarks of their respective holders.
DOCUMENT DISCLAIMER STATEMENT
Every effort has been made to ensure the accuracy of this document; however, errors do occasionally
occur. CTI provides this document on an “as is” basis and assumes no responsibility for direct or
consequential damages resulting from the use of this document. This document is provided without
express or implied warranty of any kind, including but not limited to the warranties of
merchantability or fitness for a particular purpose. This document and the products it references are
subject to change without notice. If you have a comment or discover an error, please call us toll-free
at 1-800-537-8398 or email us at [e-mail].
REVISION HISTORY
V1.0
04/30/04
Original Issue
V1.1
08/25/04
Changed Profibus address switch open/close labeling
05/03/07
Fixed Profibus connector diagram, added 2500 Series® processors
V1.2
06/22/09
Added reference to WorkShop Profibus configuration documentation
V1.21
08/03/09
Corrected Profibus cable impedance typo on p.30 from “135” to “35”
V1.3
06/30/15
Added section 4.0
V1.4
11/17/15
Removed reference to Addresses 113 through 125 in Table 1. Profibus
Station Address Settings
V1.5
12/11/15
Complete edit and update on Chapter 4 w/new screen shots. Added new
reference to CTI 2500 Series® Programming Manual in Chapter 2 Pg
13.
V1.6
1/6/2016
Added reference to CTI CPU in Note on Page 7. Added info to
addressing table on Page 6 (0 is used for Master)
V1.7
24JUL2020
Corrected document title in INFO metadata

CTI 2500-RBC Installation and Operation Guide V1.6
i
PREFACE
This Installation and Operation Guide provides reference information for the CTI 2500-RBC
Profibus Remote Base Controller. The information in this manual is directed to individuals who will
be installing the module and configuring it for use with a Profibus Master.
We assume you are familiar with the installation and operation of:
1) CTI 2500 Series® and Simatic® 505® programmable controllers,
2) PLC WorkShop™ for Siemens 505™ or Com Profibus Configuration Software
Please refer to the appropriate user documentation for specific information on your programmable
controllers and I/O modules.

USAGE CONVENTIONS
NOTE:
Notes alert the user to special features or procedures.
CAUTION:
Cautions alert the user to procedures that could damage equipment.
WARNING:
Warnings alert the user to procedures that could damage equipment and endanger the user.

CTI 2500-RBC Installation and Operation Guide V1.6
i
TABLE OF CONTENTS
CHAPTER 1. DESCRIPTION ..................................................................................1
1.1. Introduction...........................................................................................................1
CHAPTER 2. INSTALLATION.................................................................................3
2.1. Installation Planning..............................................................................................3
Choosing Profibus Media 3
Wiring the Profibus Connector 3
Selecting a Profibus Address 3
Selecting a Profibus Speed 4
Selecting Slave Parameters 4
Setting Module Hardware Options 4
2.2. Power Requirements............................................................................................4
2.3. Unpacking the Module..........................................................................................4
2.4. Configuring the Module........................................................................................5
Setting the Module Option Switches 5
Setting the Output State on Communications Loss 9
Setting Software Parameters in WorkShop or Com Profibus 9
Configuring the Remote Base in WorkShop or Com Profibus 10
Exporting a Binary Configuration File from Com Profibus 10
Merging the Configuration File into the Profibus Master 10
2.5. Physical Installation........................................................................................... 10
2.6. Connecting the Profibus Cable ......................................................................... 11
2.7. Diagnostics ........................................................................................................ 12
2.8. Base Mismatch Handling in the 2500-RBC...................................................... 12
2.9. Differences Between the 2500-RBC and the 505-6870................................... 12
2.10. Diagnostics ...................................................................................................... 13
PLC Status Words 13
Diagnostic Bytes from the 2500-RBC 14
CHAPTER 3. SETTING UP THE 2500-RBC USING COM PROFIBUS.......17
3.1. Overview............................................................................................................ 17
3.2. Startup Com Profibus........................................................................................ 17
3.3. Import the 2500R.gsd file into Com Profibus.................................................... 18
3.4. Set Bus Parameters .......................................................................................... 19
3.5. Add a Master to the System and Set the Profibus Address............................. 20
3.6. Add the 2500-RBC to the System..................................................................... 23
3.7. Configure the 2500-RBC................................................................................... 23
3.8. Save the Profibus Configuration and Export the Binary File............................ 25
3.9. Merge the Binary File in Workshop................................................................... 26
3.10. Write the Configuration to the Base(s)............................................................ 28
3.11. Select Synchronous or Asynchronous and Start Profibus............................. 28
CHAPTER 4. SETTING UP THE 2500-RBC USING WORKSHOP 4.32 OR LATER.......30
4.1 Overview............................................................................................................. 30
4.2 Download GSD file from the CTI Website......................................................... 30
4.3 Start Workshop................................................................................................... 31
4.4 Profibus Configuration....................................................................................... 31

4.7 Setting Profibus Slave Parameters.....................................................................35
APPENDIX A. PROFIBUS INSTALLATION GUIDELINES.................................37
General Installation Information................................................................................37
Maximum number of stations 37
Cable Type 37
Cable Lengths 37
Bus termination 38
Bus connectors and PROFIBUS-DP/FMS interface 38
Cable laying guidelines..............................................................................................40
Laying of copper cable 40
Laying cables within control cabinets 41
Laying cables outside of control cabinets 42
SPECIFICATIONS.................................................................................................43
General ......................................................................................................................43
Ports...........................................................................................................................43
Environmental............................................................................................................43
LIMITED PRODUCT WARRANTY........................................................................45
REPAIR POLICY ...................................................................................................46

CTI 2500-RBC Installation and Operation Guide V1.6
1
CHAPTER
1.
DESCRIPTION
1.1.
Introduction
The CTI 2500-RBC Profibus Remote Base Controller is
a member of Control Technology's family of I/O
modules compatible with the programmable controllers.
The 2500-RBC Profibus Remote Base Controller (RBC)
allows a CTI 2500 Series®or Simatic® 505 I/O base to
function as a slave node on a Profibus-DP I/O channel
that complies with the PROFIBUS standard (DIN
19245, Part 3). The 2500-RBC is intended to be a
replacement for the Siemens® 505-6870 RBC. It
provides the following functions:
Compatible with CTI 2500 Series®, Simatic®
505, Siemens® S5 and S7 masters
Can be used in currently-available CTI and
Siemens® 4-, 8-, and 16-slot bases
Supports communication speeds from 9.6 Kbaud
(maximum cable distance per segment: 1200 m)
up to 12 Mbaud (maximum cable distance per
segment: 100 m).
Includes an LED display which shows error
codes or current station address.
Configurability using the Siemens® 505-6870
“gsd” file or the new CTI 2500-RBC “gsd” file
which can be downloaded from our web site
The 2500-RBC resides in CTI 2500 Series®or Simatic®
505 base. It installs in the second slot from the left,
adjacent to the power supply module.
Figure 1. 2500-RBC Front Panel

CTI 2500-RBC Installation and Operation Guide V1.6
3
CHAPTER
2.
INSTALLATION
The installation of the Model 2500-RBC Profibus Remote Base Controller consists of the following
steps:
1) Planning the installation,
2) Verifying power requirements
3) Unpacking and configuring the module,
4) Physical installation,
5) Connecting cables,
6) Checking the module operation.
2.1.
Installation Planning
Choosing Profibus Media
The 2500-RBC attaches directly to the Profibus-DP RS485 cable using a DB9 connector. The
Profibus organization recommends using bus cable as specified in EN 50170 part 8-2 and “Cable
Type A”, and should comply with the parameters below. An example cable of this type would be
Belden 3079A.
For more information on Profibus installation guidelines, see Appendix A.
Wiring the Profibus Connector
The Profibus connector should be wired as shown in Section 2.6. For more information, refer to
Appendix A.
Selecting a Profibus Address
Before proceeding, you must determine what Profibus address you will assign to the module.
Profibus addresses range from 0 to 127. In CTI 2500 Series®and Simatic® 505 systems, address 0
and addresses 113-127 are not valid. Therefore, any address between 1 and 112 is valid for the RBC
when installed in these systems. Note that each slave node and the master must have a unique address
on the bus.

CTI 2500-RBC Installation and Operation Guide V1.6
4
Selecting a Profibus Speed
The 2500-RBC supports Profibus speed from 9.6K bits/s to 12M bits/s. For more information on
selecting Profibus speed see Appendix A.
Selecting Slave Parameters
The 2500-RBC supports four parameterization options. These options are set using WorkShop, or
using the “properties” screen for the remote base in Com Profibus. For more information about these
settings, see “Setting Software Parameters in Com Profibus” in Section 2.4.
Setting Module Hardware Options
In addition to the Profibus address, the module includes a hardware setting for selecting the state of
the base discrete outputs in the event of a communications loss. The module can be configured to set
all outputs off, or to leave outputs at their last values.
2.2.
Power Requirements
The CTI 2500-RBC module consumes 2.5 watts of +5 VDC power from the backplane. Before
installing the RBC, verify that your mounting base power budget can accommodate the required
power. A good tool for performing the verification is the CTI Replacement Guide and Power
Calculator, available from our website at
www.controltechnology.com
On the main page you will find a selection for the “Selection to CTI Replacement Calculator”. This is
an excel file. Once downloaded you will open the file as a spread sheet. At the bottom of the spread
sheet you will find tabs for Instructions, Replacement Calculator and Power Calculator. Click on the
Power Calculator tab and follow the instructions.
2.3.
Unpacking the Module
Open the shipping carton and remove the special anti-static bag that contains the module.
After discharging any static build-up, remove the module from the static bag. Do not discard the
static bag. Always use this bag for protection against static damage when the module is not inserted
into the I/O base.
CAUTION:
The components on the 2500-RBC module printed circuit card can be damaged by static
electricity discharge. To prevent this damage, the module is shipped in a special anti-static
bag. Static control precautions should be followed when removing the module from the bag
and when handling the printed circuit card during configuration.

CTI 2500-RBC Installation and Operation Guide V1.6
5
2.4.
Configuring the Module
There are six steps to configuring the module and
getting it operational on a Profibus network:
1. Setting the module option switches
2. Setting the output state on communication
loss (freeze jumper)
3. Setting software parameters in WorkShop or
Com Profibus
4. Configuring the remote base in in WorkShop
or Com Profibus
5. Exporting a binary configuration file (Com
Profibus only)
6. Merging the configuration file into the
Profibus master (Com Profibus only)
For detailed information on using Com Profibus to
configure a remote base with the 2500-RBC, refer to
Chapter 3.
Setting the Module Option Switches
Switches on the 2500-RBC are used to select the
following
•Serial Port Baud Rate
•Profibus Address
•Display mode
Figure 2 indicates the location of the option switches and freeze jumper. The remainder of this
section describes the function of the individual switches.
SW1 through SW3 –Serial Port Baud Rate.
Switches 1-3 are used for setting the baud rate of the serial port. Serial port operations are not
currently implemented in the product.
Baud rate
SW1
SW2
SW3
38400
0
0
1
19200
1
1
1
9600
1
1
0
2400
1
0
0
1200
0
1
0
300
0
0
0
Invalid
0
1
1
Invalid
1
0
1
Figure 2. Switch Locations
freeze jumper setting
option switches

CTI 2500-RBC Installation and Operation Guide V1.6
6
SW4 through SW10 - Profibus Address
Switches 4 through 10 are used to assign a station address to the RBC for identification on the
Profibus-DP I/O channel. Each station in the Profibus network must be uniquely numbered. The
station address is assigned as a binary number, with SW4 and the most significant bit (MSB) and
SW10 as the least significant (LSB). The table below shows how to set the dipswitch to a station
address between 0 and 125. Note that a switch in the “open” position=1 and a switch in the “closed”
position=0.
Table 1. Profibus Station Address Settings
Station Address
Switch Number / State
Station Address
Switch Number / State
4
5
6
7
8
9
10
4
5
6
7
8
9
10
0*(Master Address)
0
0
0
0
0
0
0
32
0
1
0
0
0
0
0
1
0
0
0
0
0
0
1
33
0
1
0
0
0
0
1
2
0
0
0
0
0
1
0
34
0
1
0
0
0
1
0
3
0
0
0
0
0
1
1
35
0
1
0
0
0
1
1
4
0
0
0
0
1
0
0
36
0
1
0
0
1
0
0
5
0
0
0
0
1
0
1
37
0
1
0
0
1
0
1
6
0
0
0
0
1
1
0
38
0
1
0
0
1
1
0
7
0
0
0
0
1
1
1
39
0
1
0
0
1
1
1
8
0
0
0
1
0
0
0
40
0
1
0
1
0
0
0
9
0
0
0
1
0
0
1
41
0
1
0
1
0
0
1
10
0
0
0
1
0
1
0
42
0
1
0
1
0
1
0
11
0
0
0
1
0
1
1
43
0
1
0
1
0
1
1
12
0
0
0
1
1
0
0
44
0
1
0
1
1
0
0
13
0
0
0
1
1
0
1
45
0
1
0
1
1
0
1
14
0
0
0
1
1
1
0
46
0
1
0
1
1
1
0
15
0
0
0
1
1
1
1
47
0
1
0
1
1
1
1
16
0
0
1
0
0
0
0
48
0
1
1
0
0
0
0
17
0
0
1
0
0
0
1
49
0
1
1
0
0
0
1
18
0
0
1
0
0
1
0
50
0
1
1
0
0
1
0
19
0
0
1
0
0
1
1
51
0
1
1
0
0
1
1
20
0
0
1
0
1
0
0
52
0
1
1
0
1
0
0
21
0
0
1
0
1
0
1
53
0
1
1
0
1
0
1
22
0
0
1
0
1
1
0
54
0
1
1
0
1
1
0
23
0
0
1
0
1
1
1
55
0
1
1
0
1
1
1
24
0
0
1
1
0
0
0
56
0
1
1
1
0
0
0
25
0
0
1
1
0
0
1
57
0
1
1
1
0
0
1
26
0
0
1
1
0
1
0
58
0
1
1
1
0
1
0
27
0
0
1
1
0
1
1
59
0
1
1
1
0
1
1
28
0
0
1
1
1
0
0
60
0
1
1
1
1
0
0
29
0
0
1
1
1
0
1
61
0
1
1
1
1
0
1
30
0
0
1
1
1
1
0
62
0
1
1
1
1
1
0
31
0
0
1
1
1
1
1
63
0
1
1
1
1
1
1
Table 1. Profibus Station Address Settings

CTI 2500-RBC Installation and Operation Guide V1.6
7
Station Address
Switch Number / State
Station Address
Switch Number / State
4
5
6
7
8
9
10
4
5
6
7
8
9
10
64
1
0
0
0
0
0
0
95
1
0
1
1
1
1
1
65
1
0
0
0
0
0
1
96
1
1
0
0
0
0
0
66
1
0
0
0
0
1
0
97
1
1
0
0
0
0
1
67
1
0
0
0
0
1
1
98
1
1
0
0
0
1
0
68
1
0
0
0
1
0
0
99
1
1
0
0
0
1
1
69
1
0
0
0
1
0
1
100
1
1
0
0
1
0
0
70
1
0
0
0
1
1
0
101
1
1
0
0
1
0
1
71
1
0
0
0
1
1
1
102
1
1
0
0
1
1
0
72
1
0
0
1
0
0
0
103
1
1
0
0
1
1
1
73
1
0
0
1
0
0
1
104
1
1
0
1
0
0
0
74
1
0
0
1
0
1
0
105
1
1
0
1
0
0
1
75
1
0
0
1
0
1
1
106
1
1
0
1
0
1
0
76
1
0
0
1
1
0
0
107
1
1
0
1
0
1
1
77
1
0
0
1
1
0
1
108
1
1
0
1
1
0
0
78
1
0
0
1
1
1
0
109
1
1
0
1
1
0
1
79
1
0
0
1
1
1
1
110
1
1
0
1
1
1
0
80
1
0
1
0
0
0
0
111
1
1
0
1
1
1
1
81
1
0
1
0
0
0
1
112
1
1
1
0
0
0
0
82
1
0
1
0
0
1
0
113*
Invalid Addresses
83
1
0
1
0
0
1
1
114*
84
1
0
1
0
1
0
0
115*
85
1
0
1
0
1
0
1
116*
86
1
0
1
0
1
1
0
117*
87
1
0
1
0
1
1
1
118*
88
1
0
1
1
0
0
0
119*
89
1
0
1
1
0
0
1
120*
90
1
0
1
1
0
1
0
121*
91
1
0
1
1
0
1
1
122*
92
1
0
1
1
1
0
0
123*
93
1
0
1
1
1
0
1
124*
94
1
0
1
1
1
1
0
125*
NOTE:
The address setting on the 2500-RBC switches must match the address set for the base in
WorkShop or Com Profibus for proper operation
NOTE:
When connecting the 2500-RBC to a CTI 2500 CPU or a 545/555/575 CPU, only addresses between
1 and 112 are valid.
SW11 - Display Mode. Switch 11 controls the display mode of the LED status display to show either
the station address or the module status.

CTI 2500-RBC Installation and Operation Guide V1.6
8
•When switch 11 is set to 1 (closed), the station address of the RBC is displayed as a three
digit number, one digit at a time. There is a short pause after each digit, then a long pause
after the last digit.
•When switch 11 is set to 0 (open), the status of the RBC is displayed according to the status
codes below.
Display
Definition
Communications
to RBC
Comment / Action
0
Module Ready
OK
Fully Operational and Online to Master.
1
Diagnostic Failure
None
Serious malfunction. Place system in safe
state and consult CTI technical support
2
Module Mismatch
OK
I/O modules installed do not match the
expected configuration in the master.
3
No Communications
None
There is no communication with the master.
Place the system in a safe state. Check
cabling and connection to the master.
7
No Configuration
OK
Enter a Profibus Configuration.
a
Module Mismatch –
wrong module
(Rev 6.0 and >)
OK
The wrong module is inserted into a
configured slot with Simatic® 505 mismatch
mode disabled.
A
Diagnostic failure
Serious malfunction. Place system in safe
state and consult CTI technical support.
b
RBC in wrong Slot
(Rev 6.0 and >)
None
Insert RBC into Correct Slot.
E
Diagnostic failure
None
Serious malfunction. Place system in safe
state and consult CTI technical support.
.
50X Ignore
Mismatch is enabled
OK
The “.” Character is turned on in conjunction
with the other displayed number when the
50X Ignore Mismatch parameter is enabled.
SW12 –Reserved. This switch position is reserved for future use.
NOTE:
The Option switches are read only at module startup. If you change the switch position after startup,
you must reset the module before the setting will take effect.

CTI 2500-RBC Installation and Operation Guide V1.6
9
Setting the Output State on Communications Loss
When I/O channel communication to a remote base is lost, the state of the discrete outputs is
determined by the selection made on the 2500-RBC jumper JP1 (Off/Freeze). Figure 2 shows the
location of the jumper on the 2500-RBC.
NOTE:
The 2500-RBC ships with the FREEZE jumper in the OFF setting.
NOTE:
If the jumper JP1 is missing from the board, the 2500-RBC defaults to the OFF setting.
For discrete output modules, the state of the outputs is determined solely by the position of the
Off/Freeze jumper JP1 on the 2500-RBC.
For analog/word output modules, the state of the outputs is influenced not only by the position of the
Off/Freeze jumper but by the output module’s (Zero/Hold Last Value) selection, if the module has
that option. See the table below.
RBC Off/Freeze
Selection
Analog/Word Module
Zero/Hold Selection
Analog/Word Output
State
Off
Zero
Zero*
Off
Hold Last Value
Last Value
Off
No selection
Last Value
Freeze
Zero
Last Value
Freeze
Hold Last Value
Last Value
Freeze
No selection
Last Value
*see the user manual of your analog/word output module for details
Notice that the Freeze option on the RBC overrides the Zero selection on the analog/word output
module; likewise, when Hold Last Value is selected on the analog/word output module, that selection
overrides the “Off”option on the RBC jumper.
Setting Software Parameters in WorkShop or Com Profibus
The 2500-RBC has parameters that are specified using the Com Profibus configuration utility
software. Refer to the Chapter 3 for information about using Com Profibus. The paragraphs below
describe the parameters used to set up the 2500-RBC.

CTI 2500-RBC Installation and Operation Guide V1.6
10
The Discrete I/O Interval parameter defines the rate in milliseconds at which the 2500-RBC updates
I/O modules. This parameter specifies the minimum time between updates of the discrete I/O
modules. Valid values are 1-255 and the default value is 1.
The Word I/O Update Factor controls how often the word I/O modules are updated. The Word I/O
Factor is the number of discrete I/O updates performed per word update; for example, if the factor is
2, the word I/O modules are updated on every second discrete I/O update. Valid values are 1-255 and
the default value is 2.
The 50X Ignore Mismatch Mode parameter allows you to select the way I/O configuration
mismatches are handled. With the default setting, “Disable,” the 2500-RBC handles I/O configuration
mismatches according to DP Standard mode, meaning that the configuration sent by the CPU to the
RBC must match the actual base configuration exactly, or else no I/O updates are performed. If you
enable 50X Ignore Mismatch Mode, the RBC performs updates with all modules whose configuration
matches, omitting only those modules whose configuration does not match. This mode of operation
does not conform to the DP Standard. For detailed information about how mismatches are indicated
and handled, see Section 2.8.
Configuring the Remote Base in WorkShop or Com Profibus
The remote base must be configured in WorkShop or Com Profibus to describe to the Profibus Master
which I/O modules are installed. In Com Profibus, this configuration is done using the “Properties” /
“Configure” / “Module” dialog. For each slot in the base, simply select the installed CTI or
Siemens® I/O module from the list. For more information or if you’re using WorkShop, see Chapter
4.
Exporting a Binary Configuration File from Com Profibus
Once the RBC has been parameterized and configured in Com Profibus, a binary file is exported
which contains the configuration information. This file is used for setup of the Profibus Master. For
more information, see Chapter 3. This export step is not required when using WorkShop.
Merging the Configuration File into the Profibus Master
The exported binary file must be merged with the Profibus Master to bring in the I/O configuration of
the remote base. For more information about Merging the configuration file in Workshop (when
using the 2500-RBC with CTI 2500 Series® or Simatic® 505 PLC’s), see Chapter 3. This merge
step is not required when using WorkShop.
2.5.
Physical Installation
To insert the module into the I/O base, hold the top and bottom of the bezel and slide the module
carefully into the slot, pushing it all the way into the base. If you have inserted the module correctly,
you will feel a slight increase in resistance as the module mates with the base backplane connector.
Once the module is fully seated in the slot, tighten the captive screws at the top and bottom to hold
the module in place. To remove the module from the I/O base, loosen the captive screws, then move
the module. Take care not to damage the connector at the back of the module when inserting or
removing the module.

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2.6.
Connecting the Profibus Cable
The Profibus port is used to connect the 2500-RBC to a Profibus DP network. Appendix A describes
how to connect a 12 Mbaud RS-485 cable to the PROFIBUS-DP port. The figure below shows the
required pinout for the DB9 Profibus port.
NOTE:
NOTE: Pins 2 and 7 are “No Connect” for the RBC. For some PROFIBUS products, these pins are
used to provide 24 VDC for powering a programming or configuration tool. Such tools are not
powered by the RBC; however, it is acceptable for an externally-powered PROFIBUS programming
or configuration tool to drive pins 2 and 7 to 24 VDC.
1
2
3
4
5
9
8
7
6
BIAS SUPPLY GND
TX/RX +
TX/RX –
(D-shell)
CHASSIS GND
Female 9-Pin D-Connector
Pin Signal
1 CHASSIS GND
2 NO CONNECT
3* TX/RX+
4 RTS
5 BIAS SUPPLY GND
6 BIAS SUPPLY +5V
7 NO CONNECT
8* TX/RX-
9 BIAS SUPPLY GND
* for Pin 3: Terminal B on Siemens connector
* for Pin 8: Terminal A on Siemens connector
BIAS SUPPLY +5V
CAUTION:
Pin 5 (BIAS SUPPLY +5V) and Pin 6 (BIAS SUPPLY GND) on the Profibus-DP connector are
designed to support termination of the Profibus-DP cable only. These pins have a limited
output power capability of approximately 0.45W. Overloading these pins by using the voltage
to drive other than the normal terminating resistors can cause internal component damage to
the 2500-RBC.

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2.7.
Diagnostics
The standard for PROFIBUS-DP I/O, DIN 19245, Part 3, stipulates the format that each DP slave
shall use to report specific diagnostics to the DP master. The diagnostics used by the PROFIBUS-DP
RBC are described below.
NOTE: Byte 1 through Byte 15, as described in this text, correspond to Octet 1 through Octet 15 in
the PROFIBUS standard. For PROFIBUS-DP I/O, Bit 7 is the most significant bit (MSB), 0 is the
least significant bit (LSB). This may or may not correspond to the bit numbering scheme used in your
master system. For example, CTI 2500 Series® and Simatic® 505/500 controllers identify the MSB
of a byte as Bit 1, and the LSB of a byte as Bit 8. A DP diagnostic consists of two parts. The first part
(Bytes 1 through 6) is standardized for all DP slaves. The second, or extended, part (Bytes 7 through
15 in the case of the RBC) is slave-specific. In the description that follows, it is assumed that the
diagnostic has been successfully read from an RBC that has been configured and activated: that is,
that Bytes 5 and 6 equal 0xBC and 0xD0, respectively.
2.8.
Base Mismatch Handling in the 2500-RBC
The 2500-RBC automatically detects mismatches between the Profibus configuration expected by the
Profibus Master and the actual remote base configuration. Depending on the type of mismatch and
the configuration settings, the 2500-RBC can operate normally or go offline and indicate a mismatch.
The table below shows the response of the 2500-RBC under various conditions.
2500-RBC Mismatch Handling
50X Ignore Mismatch Mode = disabled
Action
Display
Outputs
Remove a module
2
Follow “freeze” jumper setting
Add a module to an open
slot
0
Normal operation. The inserted
module is ignored.
Replace a module with a
different one
a
Follow “freeze” jumper setting
50X Ignore Mismatch Mode = enabled
Action
Display
Outputs
Remove a module
2.
All other slots operate normally
Add a module to an open
slot
0.
The inserted module is ignored, all
other slots operate normally
Replace a module with a
different one
2.
The inserted module is ignored, all
other slots operate normally
2.9.
Differences Between the 2500-RBC and the 505-6870
There are minor differences between the 2500-RBC and the 505-6870 which may affect some user
applications. The differences are summarized below:

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Display –Status Codes “4”, “5”, “6”, “8”, and “C” listed on the front panel of older 2500-RBC’s are
not used. Rev 6.0 and newer 2500-RBC’s use codes “A” or “E For diagnostic failures, they also
display a new code “a” to indicate the user has an incorrect module inserted in a configured slot when
50X Ignore Mismatch is disabled. A “b” indicates the RBC is inserted into the wrong slot.
Reset switch –the 2500-RBC does not include a reset switch.
RS232 port –the 2500-RBC includes an RS232 port, but communication with the PLC using this
port is not presently implemented. Future versions of the product may contain this feature.
Mismatch handling
When 50X Ignore Mismatch is disabled and a module is inserted into an empty slot, the 2500-RBC
ignores the inserted module and continues normal operation. The 505-6870 considers this situation a
mismatch and takes the base offline.
When 50X Ignore Mismatch is disabled and the wrong module is inserted into a configured slot, the
2500-RBC displays an “a”, takes the base offline, and sets outputs based on the freeze jumper setting.
The 505-6870 displays a “2” and takes the base offline.
When 50X Ignore Mismatch is enabled and a module is inserted into an empty slot, the 2500-RBC
ignores the inserted module and continues normal operation. The 505-6870 displays a “2”, ignores
the inserted module, and continues normal operation.
When Profibus is stopped from the PLC, the 2500-RBC displays a “3”, sets outputs based on the
freeze jumper setting, and turns inputs off. The 505-6870 displays a “3”, sets outputs based on the
freeze jumper setting, and leaves inputs at their last state.
2.10.
Diagnostics
The 2500-RBC provides diagnostic information in the PLC available in status words and through
execution of the RSD instruction in the ladder logic.
PLC Status Words
NOTE: For more information on STW diagnostics, see the CTI 2500 Series® Programming
Reference Manual, Appendix A.
STW147:
This PLC status word records the number of times, since the most recent start, that the Profibus-DP
slaves have failed to respond to a request from the CPU. Each time communication is lost to the
2500-RBC, STW147 increments by 1. When there is a base mismatch detected by the 2500-RBC,
STW147 increments continuously.
STW03-STW09

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These 7 status words give the status for Profibus-DP slaves. Each bit corresponds to a particular
Profibus address, with STW03 Bit 16 being address 1 and STW09 Bit 1 being address 112. Each bit
= 0 if the address is present and operating. The bit = 1 if the address is not present or failed. When
the 2500-RBC loses communication or goes offline due to a mismatch, the corresponding bit for that
address is set = 1.
STW211-STW217
These 7 status words contains the “enable” status of each Profibus address. If the slave is enabled,
the bit = 1. If the slave is disabled, the bit = 0.
STW231 bits 1,2, and 16 indicate the OPERATE, CLEAR, and CONFIGURED state of the Profibus-
DP I/O system.
STW232-STW238 indicate the Profibus-DP slave that have signaled a diagnostic that has not been
read by an RSD instruction. The slave’s bit is a 1 if a diagnostic has been signaled and not yet read.
Diagnostic Bytes from the 2500-RBC
When an RSD instruction is executed, the 2500-RBC returns 15 bytes of information which is stored
according to the settings in the RSD instruction. In each byte, bit 7 is the MSB and bit 0 is the LSB.
Byte 1: Station_Status_1
Bit 7 = RBC parameterized from another master (see description of byte 4)
Bit 6 = Parameterization error
Bit 5 = Invalid response from RBC (always set to 0)
Bit 4 = Unsupported function request from RBC
Bit 3 = Extended diagnostics (bytes 7-15) present
Bit 2 = Configuration error
Bit 1 = RBC not ready
Bit 0 = RBC did not respond
Byte 2: Station_Status_2
Bit 7 = RBC is configured but not active (RBC can only set this to 0)
Bit 6 = Reserved
Bit 5 = RBC is operating in SYNCHRONOUS mode
Bit 4 = RBC is operating in FREEZE mode
Bit 3 = Reserved
Bit 2 = Always set to 1
Bit 1 = Always set to 0
Bit 0 = RBC waiting for parameterization
Byte 3: Station_Status_3
Bit 7 = Always set to 0
Bit 6 = Reserved