Current-source Analog Output Blocks
June 2002
GFK-0691D
3
Field Wiring ___________________________________
Terminals 5 to 32 are for field devices. They take a single wire up to
AWG #14 (avg 2.1mm
2
in cross-section). Minimum recommended
size is AWG #20 (avg .54mm
2
in cross-section).
The ground (GND) terminal (5) is for block safety. It is connected to
the block chassis, and to terminals 13, 20, 24, 28, and 32. These
terminals, which are marked GND, are for shield termination, if
desired.
Self-powered or externally-powered transmitters are wired differently
from those powered by the block.
Wiring for Block Power
For block power, connect an appropriate power source to terminals 6
and 7. For AC block power, connect the source to the H terminal
and neutral to the N terminal. For DC block power, connect the
source to the DC+ terminal and the return to the DC- terminal.
BSM
PWR
+
H or DC+
N or DC-
GND
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
4 Wire Circuit
Power
Transmitter
2 Wire Circuit
Transmitter
OUT
COM
3 Wire Circuit
+
-
Transmitter
4 Wire Circuit
DC+
DC-
DC Power Source
Transmitter
DC-
DC+
+
+BSM
-BSM
GND
EXC
IN
COM
EXC
IN
COM
GND
EXC
IN
COM
GND
EXC
IN
COM
GND
EXC
IN
COM
GND
EXC
IN
COM
Removing an Electronics Assembly ______________
The block’s Electronics Assembly can be replaced with a compatible
model without removing field wiring or reconfiguring the block.
Terminal
Assembly
Retaining
Screws
(Qty. 2)
Electronics
Assembly
Connector
Pins
1. Unscrew the retaining screws at the top and bottom of the block.
2. Using a Block Puller (IC660BLM507), engage the tabs in the first
vent slots. Move the tool to the center of the block and squeeze the
handle.
3. Pull the Electronics Assembly upward.
Warning
If power is applied to the field terminals, power is also exposed
on the connector pins at the base of the Terminal Assembly,
and electrical shock hazard exists. Do not touch the connector
pins! Death or injury may result.
Inserting an Electronics Assembly
1. Align the Electronics Assembly in the guides and push down firmly.
Caution
Do not exert excessive force; it may damage the block.
2. If unusual resistance is met, remove the Electronics Assembly. If
power is applied to the block, DO NOT TOUCH THE CONNECTOR
PINS! Inspect the Terminal Assembly, connector receptacle, and
connector edge board (on the Electronics Assembly). Be sure the
keying matches. Remove any obstacles and reinsert the
Electronics Assembly. Pay close attention to the alignment of the
guide pins.
3. Secure the Electronics Assembly with the screws on the top and
bottom of the Terminal Assembly.
LEDs ________________________________________
The block's Unit OK and I/O Enabled LEDs show its operating status.
Unit OK I/O Enabled
Meaning
ON
ON
Block functioning, CPU communicating
ON
OFF
Block functioning
No CPU communications for 3 bus scans
ON
Blinking
Block functioning, Circuit forced
Blinking ON
Circuit fault, CPU communicating
Blinking OFF
Circuit fault
No CPU communications for 3 bus scans
Alternate Blinking
Circuit fault, Circuit forced
Synchronous
Blinking
No CPU communications - block number
conflict
OFF
Blinking
Electronics/Terminal Assembly mismatch
OFF
OFF
No block power, or block faulty
