GE IC698CHS217 RX7i 17 VME Slot Rack, Rear Mount, Rear I/O access
Global Data is data which is automatically and repeatedly broadcast by a Bus Controller.
The Series 90–70 Bus Controller can send up to 128 bytes of Global Data each bus scan.
It can receive up to 128 bytes of Global Data each bus scan from each Bus Controller on
its bus.
Sending Global Data
Once set up by configuration (see chapter 3), Global Data is broadcast automatically.
Other Bus Controllers receiving the Global Data sent by a Series 90–70 PLC will place it
in these memory locations:
Series 90–70 Sends
Global Data To:
Other CPU Places Global Data in this Memory Location:
Series 90–70 PLC %I, %Q, %G, %R, %AI, %AQ memory if manually–configured, or %G
memory if automatically–configured. Memory type and beginning ad dress are chosen during configuration of the receiving bus controller.
Series 90–30 PLC %G memory location corresponding to Device Number (16–23) of the
Series 90–70 Bus Controller that sent the data.
Series Six PLC Register memory. Beginning address selected during configuration of
the Series 90–70 Bus Controller that sent the data.
Series Five PLC Register memory. Beginning address selected during configuration of
the Series 90–70 Bus Controller that sent the data.
Computer PCIM or QBIM Input Table Segment corresponding to Device Number
of the Series 90–70 bus controller that sent the data.
Receiving Global Data
The Bus Controller can be configured to receive or ignore Global Data from any other
Bus Controller. The memory type and length for incoming Global Data are also selected
during configuration, as described in chapter 3.
The Series 90–70 CPU can place incoming Global Data in %I, %Q, %G, %R, %AI, or
%AQ memory.
Example
In the following example, a Series 90–70 PLC (PLC 1) sends 64 bits of Global Data begin ning at %I0101 to another Series 90–70 PLC (PLC 2). PLC 2 places this data into its own
memory beginning at %I0017. PLC 2 sends 8 words of %AQ data beginning at
%AQ0001 to PLC 1. PLC 1 places this data into its own memory beginning at %AI0032.

1. Be sure the rack is powered down.
2. Position the Bus Controller at its intended location.
3. Push the Bus Controller into the card guide until it is aligned with the connector
on the rack backplane.
4. Pressing the upper and lower flanges on the left of the module, push it into the
connector until it clicks onto the rack rails.
Look to see that the board has seated properly in the connector.
5. Complete the bus connections to the front of the board as described on the next
page.
Removing the Bus Controller
1. Power down the rack in which the Bus Controller is located. Before removing
power, it is important to consider the impact on the controlled process.
2. If the PLC is not part of a redundant system, the bus wiring can be removed from
the Bus Controller.
If the PLC is part of a redundant system and another CPU on the bus is now functioning as the controller, the Bus Controller can be removed without powering down
the bus, provided the Bus Controller’s Serial 1 terminals and Serial 2 terminals have
been jumpered as described in this chapter. If this has been done, do not disconnect
the bus cable or any terminating resistor. Remove the terminal assembly from the
Bus Controller carefully. Avoid contact with exposed cable wiring. Place the terminal assembly with the bus wiring still attached, in a protected location.
Caution
If exposed wiring comes in contact with conductive material, data on the
bus may be corrupted, possibly causing the system to shut down.
3. Squeeze the retaining clips at the top and bottom of the cover to disengage them
from the rack rails.
4. Pull the board firmly to remove it from the backplane connector.
5. Slide the board out of the card guide to remove it from the rack.