Emerson PACSystems RX3i User manual

USER MANUAL
GFK-2892G
Sep 2019
PACSystemsTM RX3i
GENIUS COMMUNICATIONS GATEWAY
USER MANUAL

User manual Contents
GFK-2892G Sep 2019
Contents i
Contents
Chapter 1: Introduction ..........................................................1
1.1 Revisions in this Manual......................................................................................................................... 1
1.2 Acronyms and Abbreviations................................................................................................................. 2
1.3 PACSystems Documentation................................................................................................................. 3
1.4 Description ............................................................................................................................................ 4
1.5 Product Overview .................................................................................................................................. 5
1.6 Specifications ........................................................................................................................................ 6
1.7 Controls and Indicators.......................................................................................................................... 7
1.7.1 Mounting.................................................................................................................................. 8
1.8 PROFINET Operation Overview.............................................................................................................. 9
1.9 System Limits ...................................................................................................................................... 13
1.10 Operational Differences vs. Genius Bus Controller............................................................................... 14
1.11 Supported Genius Devices................................................................................................................... 16
Chapter 2: Installation ..........................................................18
2.1 Pre-Installation Check.......................................................................................................................... 18
2.2 Installation Location ............................................................................................................................ 18
2.3 Installation in Hazardous Areas............................................................................................................ 19
2.3.1 ATEX Zone 2 ........................................................................................................................... 19
2.3.2 ATEX Marking ......................................................................................................................... 19
2.4 Module Installation.............................................................................................................................. 19
2.4.1 Install SD Card ........................................................................................................................ 19
2.4.2 Mounting the GCG001 ........................................................................................................... 20
2.4.3 GCG001 Module Removal ...................................................................................................... 22
2.4.4 Light-Emitting Diode (LED) Indications................................................................................... 23
2.4.5 Fault Notifications .................................................................................................................. 24
2.5 Configuring the Genius Gateway to Operate with the RX3i CPU.......................................................... 24
2.6 Ethernet Port Connections .................................................................................................................. 24
2.6.1 RJ-45 Port Connections........................................................................................................... 25
2.7 Firmware Updates ............................................................................................................................... 25
2.8 Spare Parts........................................................................................................................................... 26
Chapter 3: Configuration ......................................................27
3.1 Configuration Tools ............................................................................................................................. 27
3.2 Configuration Overview....................................................................................................................... 27
3.2.1 GCG001 in Simplex Genius Bus Configuration........................................................................ 27
3.2.2 Genius Hot-Standby Redundancy Configuration.................................................................... 32
3.2.3 Genius Duplex Configuration.................................................................................................. 33
3.2.4 Genius Dual Bus Configuration............................................................................................... 34
3.2.5 Genius Hot Standby Dual Bus Configuration .......................................................................... 35

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Contents ii
Chapter 4: System Operation ................................................37
4.1 System Overview................................................................................................................................. 37
4.1.1 Communications.................................................................................................................... 37
4.1.2 Redundancy............................................................................................................................ 38
4.1.3 I/O Scans................................................................................................................................. 40
4.1.4 Alarms .................................................................................................................................... 40
Chapter 5: Diagnostics..........................................................42
5.1 Status Data .......................................................................................................................................... 42
5.1.1 Gateway Status Data .............................................................................................................. 42
5.1.2 Genius Status Data ................................................................................................................. 44
5.1.3 Fault Status Data .................................................................................................................... 44
5.2 Module LED Indicators ......................................................................................................................... 44
5.3 Power-Up............................................................................................................................................. 45
5.3.1 Problems during Power-up ..................................................................................................... 45
5.3.2 Transitioning from Firmware Update Mode to Operational Mode .......................................... 45
5.4 Module Faults in the RX3i I/O Fault Tables ........................................................................................... 45
5.4.1 Fault Types Reported to the RX3i Controller I/O Fault Table ................................................... 46
5.4.2 Clearing the RX3i Fault Tables ................................................................................................ 50
Chapter 6: COMMREQ/Data_Init_Comm Programming.........51
6.1 COMMREQs and Passwords ................................................................................................................. 51
6.2 Programming for a COMMREQ Communication Request.................................................................... 51
6.3 COMMREQ Command Block Format ................................................................................................... 52
6.3.1 COMMREQ Command Block Contents ................................................................................... 53
6.3.2 COMMREQ Commands Supported by the Genius Gateway (GCG001) ................................... 55
6.3.3 COMMREQ Command Block Quick Reference........................................................................ 56
6.3.4 Mechanics of the COMMREQ Instruction................................................................................ 57
6.3.5 Comparison: COMMREQ vs Data_Init_Comm ........................................................................ 63
6.3.6 COMMREQ Differences: Genius Bus Controllers and Genius Gateway .................................... 64
6.4 COMMREQ Descriptions and Formats ................................................................................................. 65
6.4.1 COMMREQ #1: Pulse Test Command ..................................................................................... 65
6.4.2 COMMREQ #2: Read Configuration Command....................................................................... 66
6.4.3 COMMREQ #3: Write Configuration Command...................................................................... 67
6.4.4 COMMREQ #4: Read Diagnostics Command .......................................................................... 68
6.4.5 COMMREQ #5: Clear Circuit Fault Command ......................................................................... 70
6.4.6 COMMREQ #6: Clear All .......................................................................................................... 70
6.4.7 COMMREQ #7: Assign Monitor Command ............................................................................. 71
6.4.8 COMMREQ #8: Enable/Disable Outputs Command................................................................ 73
6.4.9 COMMREQ #10: Switch BSM Command................................................................................. 73
6.4.10 COMMREQ #11: Read Device Command................................................................................ 74
6.4.11 COMMREQ #12: Write Device Command............................................................................... 76

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Contents iii
6.4.12 COMMREQ #19: Read Identification....................................................................................... 77
6.4.13 COMMREQ #20: Write Point Command ................................................................................. 79
6.4.14 COMMREQ #21: Read Block I/O Command ............................................................................ 79
6.4.15 COMMREQ #22: Read Map Command.................................................................................... 85
6.4.16 COMMREQ #23: Write Map Command................................................................................... 87
6.4.17 COMMREQ #24: Read Data Command ................................................................................... 87
6.4.18 COMMREQ #25: Write Data Command .................................................................................. 89

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iv
Warning Notes as Used in this Publication
Warning
Warning notices are used in this publication to emphasize that hazardous voltages,
currents, temperatures, or other conditions that could cause personal injury to exist
in this equipment or may be associated with its use.
In situations where inattention could cause either personal injury or damage to
equipment, a Warning notice is used.
Notes: Notes merely call attention to information that is especially significant to understanding and operating the
equipment.
These instructions do not purport to cover all details or variations in equipment, nor to provide for every
possible contingency to be met during installation, operation, and maintenance. The information is supplied
for informational purposes only, and Emerson makes no warranty as to the accuracy of the information
included herein. Changes, modifications, and/or improvements to equipment and specifications are made
periodically and these changes may or may not be reflected herein. It is understood that Emerson may make
changes, modifications, or improvements to the equipment referenced herein or to the document itself at any
time. This document is intended for trained personnel familiar with the Emerson products referenced herein.
Emerson may have patents or pending patent applications covering subject matter in this document. The
furnishing of this document does not provide any license whatsoever to any of these patents.
Emerson provides the following document and the information included therein as-is and without warranty of
any kind, expressed or implied, including but not limited to any implied statutory warranty of merchantability
or fitness for particular purpose.

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Introduction 1
Chapter 1: Introduction
This manual describes the RX3i Genius Communications Gateway, which acts as a gateway
between PROFINET and Genius I/O. Introductory material may be found in this chapter.
Chapter 2 provides installation and set-up information. Chapter 3 provides configuration
instructions. Chapter 4 describes system operation. Chapter 5 provides diagnostic
information. Chapter 6 covers the use and format of ladder logic COMMREQ instructions.
1.1 Revisions in this Manual
Rev
Date
Description
G
Aug 2019
Following Emerson’s acquisition of this product, changes have been
made to apply appropriate branding and registration of the product
with required certification agencies. No changes to material, process,
form, fit or functionality.
F
Mar 2019
In Section 5.1.3, added Fault Status Data.
E
Oct 2018
Added note 3.2.2 concerning PNC001 Critical Network Ports feature
with GCGs.
D
Mar 2018
Added compatibility with CPE302.
C
Dec 2017
Added support for Field Control Bus Interface Unit.
Added Outputs at Startup hardware configuration parameter.
Added Enable/Disable Outputs and Switch BSM COMMREQs.
Documented GCG001 Units deployed in Genius Hot Standby Dual Bus
Redundancy (Section 3.2.5).
B
Aug 2016
Added support for VersaMax Genius Network Interface (GNIU)
Added support for IC660BSS101 isolated I/O block
Added support for additional Genius baud rates
A
Mar 2015
Behavior of GCG001 with respect to input references associated with a
faulted block is described in Section 1.10, with workaround in Section
4.1.4.
Correction to Figure 27: Genius Hot Standby Redundancy to indicate
CPU type is CRU and RMX modules are required.
Clear All Faults can now be dispatched to all blocks on the bus in a
single command. See Section 6.4.6.
-
Jun 2014
Initial release

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Introduction 2
1.2 Acronyms and Abbreviations
AR
PROFINET Application Relationship
CR
PROFINET Communication Relationship
DCP
PROFINET Discovery & Configuration Protocol
GBIU
Genius Bus Interface Unit
GCG
Genius Communications Gateway (specifically GCG001)
GENA
Genius Network Adaptor
GENI
Genius Network Interface
GNIU
Genius Network Interface Unit
GR7
Series 90-70 Remote I/O Scanner (IC697BEM733)
GSDML
General Station Description Markup Language
HHM
Genius Hand-Held Monitor
HWC
Hardware Configuration (in PME)
LAN
Local Area Network
LED
Light Emitting Diode
MRC
Ethernet Media Redundancy Client
MRM
Ethernet Media Redundancy Manager
MRP
Ethernet Media Redundancy Protocol
NRT
Non-Real-Time PROFINET Communication
PCIM
Personal Computer Interface Module
PME
PAC Machine Edition
PNC
PROFINET Controller
PPV
PLC Protocol Variables
RT
Real-Time PROFINET Communication
SBA
Genius Serial Bus Address
SD
Secure Digital Card Slot
STP
Shielded Twisted Pair
UTP
Unshielded Twisted Pair

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Introduction 3
1.3 PACSystems Documentation
PACSystems Manuals
PACSystems RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222
PACSystems RX7i, RX3i and RSTi-EP CPU Programmer’s
Reference Manual GFK-2950
PACSystems RX7i, RX3i and RSTi-EP TCP/IP Ethernet
Communications User Manual GFK-2224
PACSystems TCP/IP Ethernet Communications
Station Manager User Manual GFK-2225
C Programmer’s Toolkit for PACSystems GFK-2259
PACSystems Memory Xchange Modules User’s Manual GFK-2300
PACSystems Hot Standby CPU Redundancy User Manual GFK-2308
PACSystems Battery and Energy Pack Manual GFK-2741
PAC Machine Edition Logic Developer Getting Started GFK-1918
PAC Process Systems Getting Started Guide GFK-2487
PACSystems RXi, RX3i, RX7i and RSTi-EP Controller
Secure Deployment Guide GFK-2830
PACSystems RX3i & RSTi-EP PROFINET I/O Controller Manual GFK-2571
PACSystems RX3i Genius Communications Gateway GFK-2928
RX3i Manuals
PACSystems RX3i System Manual GFK-2314
PACSystems RX3i PROFINET Scanner Manual GFK-2737
PACSystems RX3i CEP PROFINET Scanner User Manual GFK-2883
Distributed I/O Systems Manuals
Genius I/O System and Communications User’s Manual GEK-90486-1
Genius I/O Analog and Discrete Blocks User’s Manual GEK-90486-2
Genius Hand-Held Monitor User’s Guide GFK-0121
VersaMax Systems Manuals
VersaMax System Genius Network Interface Unit User’s Manual GFK-1535
In addition to these manuals, datasheets and product update documents describe
individual modules and product revisions. The most recent PACSystems documentation is
available on the EMERSON support website https://www.emerson.com/Industrial-
Automation-Controls/support.

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Introduction 4
1.4 Description
The RX3i Genius Communications Gateway, IC695GCG001 (or GCG001), interfaces Genius
IO devices on a Simplex Genius Serial Bus to an EMERSON PROFINET IO Controller.
Figure 1: Simplex PLC System Using Genius Gateway GCG001
The GCG001 operates as a Genius Bus Controller on a Genius network. It scans the Genius
IO devices configured to it, retrieving input data and providing output data. It then
exchanges that data with its configured PROFINET IO Controller over its Ethernet interfaces
at the configured production rate. The GCG001 can manage communications for up to 31
Genius IO devices on a single Genius Serial Bus.
The GCG001 also operates as an IO Device on PROFINET. It may be controlled by any of the
following PROFINET IO Controllers:
•PNC001 (the RX3i rack-mounted PNC module), or by
•CPE330 LAN 2 when configured as a PROFINET LAN, or by
•CPE400 LAN 2 when configured as a PROFINET LAN.
Thus, when correctly configured, the entire Genius Bus, including the GCG001 itself,
becomes visible to the controlling PLC. Note that the GCG001 operates only with EMERSON
PLC PROFINET IO Controllers.
PROFINET operates on an Ethernet network. If the Ethernet network or Genius serial bus
communications are lost, the GCG001 manages I/O states according to the individual
module configurations.
Both PROFINET and Genius may be set up in Redundant configurations. These are discussed
later in this manual.

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Introduction 5
1.5 Product Overview
Features of the GCG001 module include:
•Attachment of two RJ-45 Ethernet connections (Ports 1 & 2)
•Support for both star (switched) and linear (daisy-chained) network topologies
•Supports Ethernet Media Redundancy Protocol (MRP)
•LEDs to indicate Ethernet status (ACT & LINK)
•Genius bus terminal block attachment
•Supports Genius Redundancy consisting of a single Genius bus with two GCG001
Gateways, one at SBA #30 and the other at SBA #31.
•LED to indicate Genius Communications Status (COM)
•LEDs to indicate module status (refer to module header)
•Panel-mount (typical)
•Optional mounting in RX3i expansion slot
•Cable tie-down loop on underside of module (at front)
•24Vdc power connector on underside of module
•0.2A maximum current draw
•Secure Digital (SD) Card Slot, accessible at rear of module
•Firmware load pushbutton, accessible at rear of module
Figure 2: GCG001 Module
Note: Although the hardware supports the 10/100BASE TX Ethernet standard, PROFINET I/O over
wired infrastructure must be 100Mbps full-duplex or faster. 10Mbps should not be used for
PROFINET.

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Introduction 6
1.6 Specifications
RX3i Genius Communications Gateway Specifications
PROFINET Support
PROFINET version 2.3 Class A IO-Device
CPU Compatibility
RX3i CPE330
RX3i CPE302/CPE305/CPE310 with firmware version 8.15 or
later
RX3i CPU315/CPU320/CRU320 with firmware version 8.15 or
later
Rx3i CPE302 (any firmware version)
PNC001 Compatibility
Firmware version 2.05 or later
Embedded PROFINET
Compatibility
RX3i CPE400 embedded PROFINET
RX3i CPE330 embedded PROFINET with firmware version
8.90 or later
PAC* Machine Edition
Compatibility
PME 8.0 or later
Power Requirements
External 24Vdc: (±10%) 0.2A
Operating Temperature
Range
0 to 60°C
Number of Port Connectors
Two RJ-45
Local Area Network (LAN)
IEEE 802.2 Logical Link Control Class I
IEEE 802.3 CSMA/CD Medium Access Control 10/100 Mbps
Status Data
64 (two banks of 32 bits)
Genius Bus Support
Supports One Genius Bus.
Serial 1, Serial 2, Shield in and Shield Out, as marked.
Up to 29 additional devices supported per Genius Bus.
Selectable Baud Rate, per Genius specifications.
Genius Hot Standby and Duplex Redundancy supported.
HHM Compatibility
IC660HHM501
Other Genius Compatibility
See table in Section 1.11
SD Card
2GB or smaller. Not compatible with SDHC or SDXC cards.
Configuration
GSDML file is available on the Support website for download
and import into PME. The GSDML supporting a firmware
release is part of the firmware upgrade kit available on the
Support website.
Hot Swappable
The Genius Gateway requires an external 24Vdc power supply
and does not draw power from the Rx3i backplane. Swapping
out the GCG001 will therefore not impact the PLC. However,
this cannot be performed without disconnecting its power
supply. If configured to support Genius Hot Standby, the loss
of a single GCG001 will be tolerated; otherwise not.
For system standards, general operating specifications, and installation requirements, refer
to the PACSystems RX3i System Manual, GFK-2314.

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Introduction 7
1.7 Controls and Indicators
The following figure shows the front of the module and identifies the controls and
indicators.
Figure 3: Genius Gateway GCG001 Front Panel View

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Introduction 8
1.7.1 Mounting
The GCG001 may either be panel-mounted or be mounted in the rightmost slot (expansion
slot) of an RX3i rack (IC695CHS012 or IC695CHS016).
Note:
1. The SD Card supplied with the GCG001 will have been installed at the factory. See section
2.4.1 for instructions for installing the SD Card when doing a retrofit. The presence of the
SD Card should be checked before mounting the module.
2. Clearance of 3 inches (75mm) must be provided above and below the module for proper
ventilation and to permit cable access.
3. External power must always be supplied to the module, regardless of which mounting
arrangement is chosen. When rack-mounted, the GCG001 does not draw power from the
RX3i Universal Backplane.
RX3i Backplane Mounting
The GCG001 may be mounted in the rightmost slot (expansion slot) of an RX3i Universal
Backplane.
The two captive M3.5 screws at the rear of the GCG001 align with mating tapped holes on
the right side of the backplane, providing a convenient mounting location. When rack-
mounted, the module does not contact the backplane connector.
Panel-Mounting
Panel-mounting allows for mounting where no RX3i backplane slot is available. The two
captive M3.5 machine screws on the GCG001 can be used for attaching the unit to a panel.
Note: The panel must have a minimum thickness of 2.4mm (0.094in).
1. Drill two mounting holes using the spacing shown in the drawing (at right) and tap for
M3.5 (3.5 x 0.6mm).
2. Align the two mounting screws of the module with the mounting holes in the panel.
3. Using a Philips screwdriver, tighten the two screws to a maximum torque of 0.5 Nm (4.4 in-
lbs).

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Introduction 9
Figure 4: GCG001 Panel Mount Diagram
1.8 PROFINET Operation Overview
An RX3i Genius Communications Gateway (GCG001) uses PROFINET communications for
data exchange with the PLC. As noted above, the data rate must be 100Mbps full-duplex or
faster. The same network may be used for basic Ethernet communications, but use of a
separate Ethernet network and RX3i Ethernet interface is recommended.
PROFINET Communications
Communications on an RX3i PROFINET network use the standard PROFINET
communications described in this section. Note, however, that the Genius Gateway
GCG001 is constrained to work only with EMERSON PROFINET PLC products.

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Introduction 10
Application Relationships
Before a PROFINET IO-Controller can exchange data with a PROFINET IO-Device such as the
GCG001, an Application Relationship (connection) must be established between the
devices. The PROFINET IO-Controller automatically sets up the correct number and types of
Application Relationship and Communication Relationship channels (see below) based on
its PME configuration. Usually, only one Application Relationship is established per
IO-Device.
Communication Relationships within an Application Relationship
Within each Application Relationship, the PROFINET IO-Controller establishes the following
types of Communication Relationships (CRs):
Record Data CRs –always the first to be established within an Application Relationship.
Record Data Communication Relationships are used for non-real-time transfers of data
records such as startup parameter data, diagnostics data, identification data, and
configuration data.
IO CRs –used for the real-time, cyclic transfer of IO data
Alarm CR –used for real-time, acyclic transfer of alarms and events
The following illustration represents an Application Relationship between an RX3i PROFINET
Controller and an RX3i Genius Gateway GCG001.
Figure 5: Application Relationships between PROFINET Controller & Genius Gateway

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Introduction 11
Types of PROFINET Communications
Genius Communications Gateways use two types of PROFINET communication transfers:
real-time and non-real-time. The illustration below shows real-time communications as
solid lines and non-real-time communications as dashed lines.
Figure 6: Real-Time & Non-Real-Time communication
Real-Time (RT) communication: PROFINET real-time communication is used for time-
sensitive data. A PROFINET IO-Controller (PROFINET Controller) and PROFINET IO-Device
use two types of real-time communications to exchange data: cyclic communication and
acyclic communication:
Real-time Cyclic communication is used to periodically transfer the application’s input and
output data. Cyclic communication occurs each PROFINET IO production cycle.
Real-time Acyclic communication is used to transfer non-periodic data such as alarms.
Acyclic communication occurs only when needed.
Non-Real-Time (NRT) communication: PROFINET non-real-time communication is used for
less time-sensitive data such as configuration, parameterization, diagnostics, and
identification data.
Operations of the Genius Communications Gateway
The Genius Communications Gateway performs the following operations:
Consumes PROFINET IO-Device configuration from the PROFINET IO-Controller over the
PROFINET network.
Scans input data from each Genius device it manages and produces that data to the
PROFINET IO-Controller.
Consumes the output data that it receives from the PROFINET IO-Controller and applies it
to each Genius device it manages.
Where needed, translates Genius Datagrams (background traffic) into PROFINET packages
that are sent to the PROFINET Controller. This includes Datagrams that originated at the
Genius Devices, such as Fault Reports.

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Introduction 12
Translates PROFINET packages that are sent by the PROFINET Controller into Genius
Datagrams. This includes Datagrams that originated at the PLC through use of COMMREQ
or Data_Init_Comm instructions. For example, a COMMREQ is used to generate a Clear Fault
Report datagram.
IO Scanning
In the PACSystems RX3i PROFINET network, multiple IO cycles run asynchronously and
independently. Figure 7 illustrates typical cycles in a system with an RX3i CPU with a
PROFINET Controller module communicating with a Genius Communications Gateway.
Cycles may be different for third-party devices.
Figure 7: PLC - GCG - Genius Scan Cycles
Genius IO-Device Scan: In this example, each GCG scans all its Genius devices. The GCG
stores the devices’ input data into its internal memory. Every time the GCG gets a turn on
the Genius bus, it transmits the output data from its internal memory to each of the Genius
devices.
3rd party devices: The transfer of IO data between an IO module and the PROFINET IO
network is device dependent. Refer to the third-party manufacturer documentation for
specifics for a device.
PROFINET IO Production Cycle: Each PROFINET Controller and IO-Device publishes data
from its internal memory onto the network at its scheduled PROFINET production cycle
(Note: Production cycles between IO-Controllers and IO-Devices are not synchronized; each
publishes at its configured update rate independently). The PROFINET Controller publishes
output data received from the RX3i CPU to each IO-Device, and the IO-Device publishes
input data from its memory to the PROFINET Controller.
RX3i CPU Sweep: The RX3i CPU Sweep includes both an input scan and an output scan. The
CPU input scan retrieves the current input data being stored within the PROFINET Controller
module. This input data is then available for use by the application logic. After the logic
solution, the CPU output scan writes the outputs to the PROFINET Controller.

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Introduction 13
Media Redundancy Protocol Support
PROFINET Media Redundancy Protocol (MRP) supports devices configured in a ring
topology. MRP is specified as part of IEC62439 and has been adopted by the PROFINET
specification, which provides for convenient configuration of the ring topology and
necessary parameters. Like PROFINET IO data, Media Redundancy Protocol operations are
not routable between different IP subnets.
Each device within an MRP ring has two physical pathways to the IO-Controller. To connect
to the ring, each device requires an integrated switch with at least two external ports (ring
ports) that support MRP. Devices that are not MRP-capable can be connected to a device in
the ring (i.e., an MRP-capable switch in the ring), but they should not be in the ring
themselves. The redundancy capability offered by the ring topology only extends to the
devices on the ring that are MRP-capable and enabled.
One of the devices on the ring must be configured as the Media Redundancy Manager
(MRM), and all the other devices must be configured as Media Redundancy Clients (MRCs).
The GCG001 can be configured as an MRC. Configuring the GCG as an MRC alters how the
Ethernet ports connect to the network. They attempt to indicate their state to the MRM
before allowing traffic to flow between the ports and close the ring topology through the
internal switch. They also send out notifications to the MRM when a port is lost. Operation
of the GCG001 is otherwise unchanged.
The MRP configuration is stored in non-volatile storage in the GCG001 and activated
immediately upon powering up. Non-volatile storage is updated as part of a connection with
the IO-Controller. A PROFINET Discovery & Configuration Protocol (DCP) Reset disables MRP
Client operation and updates non-volatile storage. The current state of the MRP
configuration is provided as part of the GCG’s Gateway Status Bits which are accessible to
user application logic. Refer to the description of Gateway Status Bits in Section 5.1.1 for
further details.
Fast ring-break detection is not fully functional until all MRP clients have received their MRP
configuration. For a discussion of ring-break detection and bump less operation with MRP,
refer to sections 6.1.1 and 6.1.2 in the PACSystems RX3i & RSTi-EP PROFINET I/O Controller
Manual, GFK-2571K or later.
1.9 System Limits
IO-Controllers have limitations on the size of the system they support. One of these limits is
the number of PROFINET sub-modules supported. The GCG001 uses four sub-modules: two
for basic operation and two built-in port sub-modules that are always configured. Each
Genius device attached to a GCG001 uses one additional sub-module.
Other limitations, such as the configuration and IO sizes are specific to the configuration
options chosen. Note that not every combination of options is supported in every system. If
the configuration uses all Genius bus slots with a corresponding large device count, the
memory of the IO-Controller system will be a limiting resource.
Refer to the PACSystems RX3i & RSTi-EP PROFINET I/O Controller Manual, GFK-2571, for
actual limits in the RX3i PROFINET Controller (PNC001) and the embedded PROFINET
controllers.

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Introduction 14
Refer to the Genius I/O System and Communications User's Manual, GEK-90486-1 for
information on how much I/O, and which type of I/O, need to be allocated to Genius devices.
PME (v8.0 or later) considers both system limits and I/O allocation.
1.10 Operational Differences vs. Genius Bus
Controller
Persons migrating from a Genius environment where the Genius Bus Controller performs
functions like those of the GCG001 will want to be aware of the following differences:
1. COMMREQ function block SYSID and Task parameters change. SYSID is now the
rack & slot of the PNC connected to the GCG001. Task is now 132.
2. COMMREQ data blocks are different, mainly due to added PROFINET Device
Number and expansion of memory address fields from one word to two words. See
COMMREQ summary in Section 0.
3. Pulse Test and Assign Monitor COMMREQs do not support Genius bus address of
255 to send messages to all blocks.
4. COMMREQ commands: GCG001 does not support all datagrams. See section 6.3.2
for a corresponding list of supported COMMREQs.
5. GCG001 supports hot-standby, duplex, and dual-bus redundancy modes
1
. Dual-
bus requires additional application code.
6. GCG001 can be assigned to bus addresses 30 and 31 only.
7. GCG001 does not support GENI, GENA, or PCIM.
8. Prior to V1.1.1, fault contact operation has changed. Whenever there is a fault on a
single channel of a Genius block, all fault contacts associated with that Genius block
will become active. All faults on that device must be cleared before any of the fault
contacts will de-energize. Beginning with V1.1.1, when there is a fault on a single
channel, none of the fault contacts will become active.
9. Genius faults routed through a GCG001 appear as PROFINET faults to the CPU. The
same fault routed through a Genius Bus Controller will present a different error
code.
10. Circuit Fault Behavior:
•Prior to GCG firmware release V1.1.1, when a Genius block encounters a circuit
fault on one or more points or channels, the GCG001 causes all the input
references associated with that block to either hold last state or go to default
values until such time as the fault is cleared. See the Alarms discussion in
section 4.1.4 for a work-around to this behavior.
•Beginning with V1.1.1, when a Genius block encounters a circuit fault on one
or more points or channels, the GCG will cause only the faulted input references
1
For Dual Bus Redundancy, GCG001 firmware version 2.2.0 or later is required; for all other redundancy modes, version 1.1.0 (minimum)
is required.

User manual Chapter 1
GFK-2892G Sep 2019
Introduction 15
to hold the last state or go to default values. The other points or channels on
the block will continue to operate normally.
11. Beginning with V2.2.2, Addition of Module and Loss of Module faults will not be
logged when Genius devices change their online status with the Genius bus. The
user must monitor the 32 bits of Genius Status Data to determine if Genius Devices
are operational or no
12. t