Acromag 948 Series, User Manual

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AVME948x USER'S MANUAL Digital I/O Board
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For bit positions corresponding to output modules, a "1" state
will turn the I/O point on and the output latch will draw current. A "0"
state will turn the module off. For bit positions corresponding to
input modules, a "1" state indicates the presence of a low voltage for
the "on" state of the module. A "0" state indicates a high voltage is
present.
Configuring The PB16A
If the PB16A is to receive power from the AVME9480, install a
jumper at pin 1 or pin 49 of the PB16A termination panel. Install
appropriate solid-state relay modules. Then connect the 50-pin
ribbon cable between the PB16A and the AVME9480 while
observing the pin 1 index mark.
USE WITH OTHER DEVICES
The AVME9480 Digital I/O Board can interface to a variety of
discrete devices, such as relays, switches, contact closures, and
indicators. The optional termination panel Model 6980-16U can be
used to connect field wiring to the digital I/O card. The following
guidelines should be followed to insure proper interfacing.
Relays And Other Inductive Loads
When driving relays coils or other inductive loads, the
PROTECT line should be tied to the voltage supply of the loads.
This puts a suppression diode across each load to limit the voltage
spike (reverse emf) generated when an inductive load is switched off
quickly. However, since PROTECT is common to all 16 outputs, the
supply voltage for all of the loads must be the same. Otherwise,
each load must have its own external diode and the pullup resistors
should be removed from the digital I/O card. See Drawing 4500-743
for relay driver configurations.
Contact Closures And Switches
When sensing contact closures that already are connected to a
voltage source, the pullup resistor networks should be removed.
The input voltage should be within the range listed in the
specifications. For isolated or grounded contacts, the pullups and
the +5 volt supply can be used to establish an input voltage. See
Drawing 4500-743 for various input configurations.
3.0 PROGRAMMING INFORMATION
This section provides the specific information necessary to
program the Digital I/O Board.
MEMORY MAPS
The memory map for the Industrial Digital I/O board, a non-
intelligent I/O architecture, is shown in Table 3.1. The Digital I/O
board is addressable on 1Kbyte boundries in the short address
space. All Acromag VMEbus non-intelligent slaves have a standard
interface configuration which consists of a 32 byte on-board ID
PROM and a board status register. The rest of the 1Kbyte address
space contains registers or other memory specific to the function of
the board. All addresses are in hexadecimal. The letters R and W
indicate whether a register may be Read and/or Written to. The
areas marked "undefined" in the memory map will read with all bits
high (1’s). These areas are reserved for future use. For future
compatibility, application programs should not use these areas for
any reason.
Table 3.1: AVME948x Digital I/O Board Memory Map
Base
Addr+
(Hex)
EVEN Byte
D15 D08
ODD Byte
D07 D00
Base
Addr+
(Hex)
00
↓
3E
Undefined R - Module ID PROM
01
↓
3F
40
↓
7E
Undefined Undefined
41
↓
7F
80 R/W-Interrupt
Pending/Clear R/W - Status/Control 81
82 R - Int. Inputs R/W-Interrupt Enable 83
84 R/W - Int. Level R/W-Interrupt Polarity 85
86 Undefined R/W-Point 0 Vector 87
88 Undefined R/W-Point 1 Vector 89
8A Undefined R/W-Point 2 Vector 8B
8C Undefined R/W-Point 3 Vector 8D
8E Undefined R/W-Point 4 Vector 8F
90 Undefined R/W-Point 5 Vector 91
92 Undefined R/W-Point 6 Vector 93
94 Undefined R/W-Point 7 Vector 95
96
↓
FE
Undefined Undefined
97
↓
FF
100 R/W -I/O Port 0 R/W -I/O Port 1 101
102 R/W -I/O Port 2 R/W -I/O Port 3 103
104 R/W -I/O Port 4 R/W -I/O Port 5 105
106 R/W- I/O Port 6 R/W -I/O Port 7 107
108
↓
3FE
Undefined Undefined
109
↓
3FF
Board Identification ID PROM (Read Only, 01-3F)
The Board Identification PROM occupies the 32 odd bytes
beginning at location 01. These bytes contain ASCII character
strings that identify various characteristics of the board (See Table
3.2).
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