6/98 Addendum Page 2
Control Information for the 1260-60
The following information describes the control-register-to-relay-channel mapping for a 1260-60 Relay
Module. This information may be used to control a 1260-60 when using a 1260-01T in the register-based
mode of operation.
There are two types of relays which populate the 1260-60 module. The standard relays (channels 0 through
111), are each controlled by a single bit within an 8-bit Control Register. Each of these relays is controlled by
setting or clearing a single bit within a Control Register. Control Registers on the module operate 8 channels
simultaneously. There are eight control bits per Control Register. Setting the bit to a 1 closes the relay;
setting the bit to a 0 opens the relay.
The RF relays (channels 200, 201, and 202) are each controlled by 2 bits. Each of these relays is a latching
relay. One bit is pulsed to set the relay to the OPEN state, in which the COM output is connected to the
normally closed input. A different bit is pulsed to set the relay to the CLOSED state, where the COM output is
connected to the normally open input. An OPEN or CLOSE control bit must be set high for a minimum of
15 milliseconds before it is deasserted to ensure that the latching relay is actuated.
The table below shows the mapping from logical channels to control bits. The logical channels are used
when operating the relay module in message-based mode. The control bits within the Control Registers are
used to operate the module in register-based mode.
Each Control Register is located 2 addresses from the previous Control Register. That is, each Control
Register is located at an odd address. This is shown in Table 2-2 of the 1260-01T manual. Control Register
0 is located at the “Base A24 Address” for the module. Consult the “Register-Based Operation” Section of
Chapter 2 of the 1260-01T manual for a description of calculating control register addresses.
Channel
Control Register
Control Bit
0
0
3
1
0
7
2
1
3
3
1
7
4
2
3
5
2
7
6
3
3
7
3
7
8
0
2
9
0
6
10
1
2
11
1
6
100
0
1
101
0
5
102
1
1
103
1
5
104
2
1
105
2
5
106
3
1
107
3
5
108
0
0
109
0
4
110
1
0
111
1
4
200
4
0 (CLOSE)
1 (OPEN)
201
4
2 (CLOSE)
3 (OPEN)
202
4
4 (CLOSE)
5 (OPEN)
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